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Koemets I, Wang B, Koemets E, Ishii T, Liu Z, McCammon C, Chanyshev A, Katsura T, Hanfland M, Chumakov A, Dubrovinsky L. Crystal chemistry and compressibility of Fe 0.5Mg 0.5Al 0.5Si 0.5O 3 and FeMg 0.5Si 0.5O 3 silicate perovskites at pressures up to 95 GPa. Front Chem 2023; 11:1258389. [PMID: 37867996 PMCID: PMC10587407 DOI: 10.3389/fchem.2023.1258389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 09/19/2023] [Indexed: 10/24/2023] Open
Abstract
Silicate perovskite, with the mineral name bridgmanite, is the most abundant mineral in the Earth's lower mantle. We investigated crystal structures and equations of state of two perovskite-type Fe3+-rich phases, FeMg0.5Si0.5O3 and Fe0.5Mg0.5Al0.5Si0.5O3, at high pressures, employing single-crystal X-ray diffraction and synchrotron Mössbauer spectroscopy. We solved their crystal structures at high pressures and found that the FeMg0.5Si0.5O3 phase adopts a novel monoclinic double-perovskite structure with the space group of P21/n at pressures above 12 GPa, whereas the Fe0.5Mg0.5Al0.5Si0.5O3 phase adopts an orthorhombic perovskite structure with the space group of Pnma at pressures above 8 GPa. The pressure induces an iron spin transition for Fe3+ in a (Fe0.7,Mg0.3)O6 octahedral site of the FeMg0.5Si0.5O3 phase at pressures higher than 40 GPa. No iron spin transition was observed for the Fe0.5Mg0.5Al0.5Si0.5O3 phase as all Fe3+ ions are located in bicapped prism sites, which have larger volumes than an octahedral site of (Al0.5,Si0.5)O6.
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Affiliation(s)
- Iuliia Koemets
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Biao Wang
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | - Egor Koemets
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | - Takayuki Ishii
- Institute for Planetary Materials, Okayama University, Misasa, Japan
| | - Zhaodong Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - Catherine McCammon
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Artem Chanyshev
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Tomo Katsura
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Michael Hanfland
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | | | - Leonid Dubrovinsky
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
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Li HY, Wei D, Du YH, Liu ZT, Bai ZX, Liu FS, Liu QJ. Effects of pressure on structural, electronic, optical, and mechanical properties of nitrogen-rich energetic material: 6-azido-8-nitrotetrazolo[1,5-b]pyridazine-7-amine (3at). J Mol Model 2023; 29:43. [PMID: 36653549 DOI: 10.1007/s00894-022-05440-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/27/2022] [Indexed: 01/20/2023]
Abstract
CONTEXT AND RESULTS 6-Azido-8-nitrotetrazolo[1,5-b]pyridazine-7-amine (3at) is a promising green energetic material, which meets the development requirements of environment-friendly explosives. By discussing the relationship between lattice parameters and pressure, it is found that the compression ratio indicates anisotropy of compressibility. And bond lengths get shorter under pressure, resulting in stronger intermolecular bonds. The N3 group rotates under pressure. And then, the optical properties basically change regularly with the change of pressure. As the pressure increases, the absorption range widens. In the low energy interval, it shows transparency, and then with the increase of energy and pressure, it shows better optical activity. With the increase of pressure and energy, the absorption coefficient increases, representing that the optical activity becomes high. Finally, according to the analysis of mechanical properties, 3at exhibited brittle behavior at 0 GPa and 100 GPa, while at 10 to 90 GPa, the values of ν and B/G are malleable. COMPUTATIONAL AND THEORETICAL TECHNIQUES Based on density functional theory, the crystal parameters, electronic properties, optical properties, and elastic and mechanical properties of 3at under different pressures were studied theoretically. The GGA-PW91+OBS method was used to calculate the physical parameters under pressure, such as lattice parameters, energy band structures, dielectric function, refractive index, absorption coefficient, and elastic constants. Physical properties under (3at) pressure are predicted.
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Affiliation(s)
- Hong-Yan Li
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Ding Wei
- Xi'an Modern Chemistry Research Institute, Xi'an, 710065, People's Republic of China
| | - Yi-Hua Du
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Zheng-Tang Liu
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, People's Republic of China
| | - Zhi-Xin Bai
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
| | - Fu-Sheng Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
| | - Qi-Jun Liu
- Bond and Band Engineering Group, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
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Muscarella LA, Dučinskas A, Dankl M, Andrzejewski M, Casati NPM, Rothlisberger U, Maier J, Graetzel M, Ehrler B, Milić JV. Reversible Pressure-Dependent Mechanochromism of Dion-Jacobson and Ruddlesden-Popper Layered Hybrid Perovskites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2108720. [PMID: 35181967 DOI: 10.1002/adma.202108720] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Layered Dion-Jacobson (DJ) and Ruddlesden-Popper (RP) hybrid perovskites are promising materials for optoelectronic applications due to their modular structure. To fully exploit their functionality, mechanical stimuli can be used to control their properties without changing the composition. However, the responsiveness of these systems to pressure compatible with practical applications (<1 GPa) remains unexploited. Hydrostatic pressure is used to investigate the structure-property relationships in representative iodide and bromide DJ and RP 2D perovskites based on 1,4-phenylenedimethylammonium (PDMA) and benzylammonium (BzA) spacers in the 0-0.35 GPa pressure range. Pressure-dependent X-ray scattering measurements reveal that lattices of these compositions monotonically shrink and density functional theory calculations provide insights into the structural changes within the organic spacer layer. These structural changes affect the optical properties; the most significant shift in the optical absorption is observed in (BzA)2 PbBr4 under 0.35 GPa pressure, which is attributed to an isostructural phase transition. Surprisingly, the RP and DJ perovskites behave similarly under pressure, despite the different binding modes of the spacer molecules. This study provides important insights into how the manipulation of the crystal structure affects the optoelectronic properties of such materials, whereas the reversibility of their response expands the perspectives for future applications.
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Affiliation(s)
- Loreta A Muscarella
- Center for Nanophotonics, AMOLF, Science Park 104, Amsterdam, XG 1098, The Netherlands
| | - Algirdas Dučinskas
- Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Mathias Dankl
- Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
| | - Michał Andrzejewski
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, CH-5232, Switzerland
| | | | - Ursula Rothlisberger
- Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
| | - Joachim Maier
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Michael Graetzel
- Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
| | - Bruno Ehrler
- Center for Nanophotonics, AMOLF, Science Park 104, Amsterdam, XG 1098, The Netherlands
| | - Jovana V Milić
- Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
- Adolphe Merkle Institute, University of Fribourg, Fribourg, CH-1700, Switzerland
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4
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Lima MP, Besse R, Da Silva JLF. Ab initio investigation of topological phase transitions induced by pressure in trilayer van der Waals structures: the example of h-BN/SnTe/h-BN. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:025003. [PMID: 32756023 DOI: 10.1088/1361-648x/abac8d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The combination of two-dimensional crystals through the formation of van der Waals bilayers, trilayers, and heterostructures has been considered a promising route to design new materials due to the possibility of tuning their properties through the control of the number of layers, alloying pressure, strain, and other tuning mechanisms. Here, we report a density functional theory study on the interlayer phonon coupling and electronic structure of the trilayer h-BN/SnTe/h-BN, and the effects of pressure on the encapsulation of this trilayer system. Our findings demonstrated the establishment of a type I junction in the system, with a trivial bandgap of 0.55 eV, which is 10 % lower than the free-standing SnTe one. The almost inert h-BN capping layers allow a topological phase transition at a pressure of 13.5 GPa, in which the system evolves from a trivial insulator to a topological insulator. In addition, with further increase of the pressure up to 35 GPa, the non-trivial energy bandgap increases up to 0.30 eV. This behavior is especially relevant to allow experimental access to topological properties of materials, since large non-trivial energy bandgaps are required.
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Affiliation(s)
- Matheus P Lima
- Department of Physics, Federal University of São Carlos, 13565-905, São Carlos, São Paulo, Brazil
| | - Rafael Besse
- São Carlos Institute of Physics, University of São Paulo, PO Box 369, 13560-970, São Carlos, São Paulo, Brazil
| | - Juarez L F Da Silva
- São Carlos Institute of Chemistry, University of São Paulo, PO Box 780, 13560-970, São Carlos, São Paulo, Brazil
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5
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Mouhib Y, Belaiche M, Ferdi CA, Lacham M, Elacham A. New technique for elaboration and characterization of a high voltage spinel LiCo 2O 4 cathode and theoretical investigation. NEW J CHEM 2020. [DOI: 10.1039/c9nj06126f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Nanoparticles of LiCo2O4 were elaborated for the first time at low temperature using non-standard Moroccan raw materials. All theoretical and experimental results confirm the obtaining of spinel LiCo2O4 at 400 °C, with high crystalline purity.
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Affiliation(s)
- Y. Mouhib
- Nanomaterials and Nanotechnology Unit
- E. N. S. Rabat
- Energy Research Center
- Faculty of Sciences
- Mohammed V University
| | - M. Belaiche
- Nanomaterials and Nanotechnology Unit
- E. N. S. Rabat
- Energy Research Center
- Faculty of Sciences
- Mohammed V University
| | - C. Ahmani Ferdi
- Nanomaterials and Nanotechnology Unit
- E. N. S. Rabat
- Energy Research Center
- Faculty of Sciences
- Mohammed V University
| | - Mohammed Lacham
- Afrique Câble Company (Electra Batterie)
- Boulvard Ahl Loghlam
- Route de Tit Mellil
- 20600 Casablanca
- Morocco
| | - Abdelhamid Elacham
- Nanomaterials and Nanotechnology Unit
- E. N. S. Rabat
- Energy Research Center
- Faculty of Sciences
- Mohammed V University
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6
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Smith D, Smith JS, Childs C, Rod E, Hrubiak R, Shen G, Salamat A. A CO 2 laser heating system for in situ high pressure-temperature experiments at HPCAT. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:083901. [PMID: 30184683 DOI: 10.1063/1.5040508] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 07/07/2018] [Indexed: 06/08/2023]
Abstract
We present a CO2 laser heating setup for synchrotron x-ray diffraction inside a diamond anvil cell, situated at HPCAT (Sector 16, Advanced Photon Source, Argonne National Lab, Illinois, USA), which is modular and portable between the HPCAT experiment hutches. The system allows direct laser heating of wide bandgap insulating materials to thousands of degrees at static high pressures up to the Mbar regime. Alignment of the focused CO2 laser spot is performed using a mid-infrared microscope, which addressed past difficulties with aligning the invisible radiation. The implementation of the mid-infrared microscope alongside a mirror pinhole spatial filter system allows precise alignment of the heating laser spot and optical pyrometry measurement location to the x-ray probe. A comparatively large heating spot (∼50 μm) relative to the x-ray beam (<10 μm) reduces the risk of temperature gradients across the probed area. Each component of the heating system and its diagnostics have been designed with portability in mind and compatibility with the various experimental hutches at the HPCAT beamlines. We present measurements on ZrO2 at 5.5 GPa which demonstrate the improved room-temperature diffraction data quality afforded by annealing with the CO2 laser. We also present in situ measurements at 5.5 GPa up to 2800 K in which we do not observe the postulated fluorite ZrO2 structure, in agreement with recent findings.
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Affiliation(s)
- Dean Smith
- Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
| | - Jesse S Smith
- High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - Christian Childs
- Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
| | - Eric Rod
- High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - Rostislav Hrubiak
- High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - Guoyin Shen
- High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - Ashkan Salamat
- Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
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7
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Nzogang BC, Bouquerel J, Cordier P, Mussi A, Girard J, Karato S. Characterization by Scanning Precession Electron Diffraction of an Aggregate of Bridgmanite and Ferropericlase Deformed at HP-HT. GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS : G(3) 2018; 19:582-594. [PMID: 29937698 PMCID: PMC5993221 DOI: 10.1002/2017gc007244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 01/27/2018] [Indexed: 06/08/2023]
Abstract
Scanning precession electron diffraction is an emerging promising technique for mapping phases and crystal orientations with short acquisition times (10-20 ms/pixel) in a transmission electron microscope similarly to the Electron Backscattered Diffraction (EBSD) or Transmission Kikuchi Diffraction (TKD) techniques in a scanning electron microscope. In this study, we apply this technique to the characterization of deformation microstructures in an aggregate of bridgmanite and ferropericlase deformed at 27 GPa and 2,130 K. Such a sample is challenging for microstructural characterization for two reasons: (i) the bridgmanite is very unstable under electron irradiation, (ii) under high stress conditions, the dislocation density is so large that standard characterization by diffraction contrast are limited, or impossible. Here we show that detailed analysis of intracrystalline misorientations sheds some light on the deformation mechanisms of both phases. In bridgmanite, deformation is accommodated by localized, amorphous, shear deformation lamellae whereas ferropericlase undergoes large strains leading to grain elongation in response to intense dislocation activity with no evidence for recrystallization. Plastic strain in ferropericlase can be semiquantitatively assessed by following kernel average misorientation distributions.
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Affiliation(s)
- B. C. Nzogang
- Univ. Lille, CNRS, INRA, ENSCL, UMR 8207‐UMET‐Unité Matériaux et TransformationsLilleFrance
| | - J. Bouquerel
- Univ. Lille, CNRS, INRA, ENSCL, UMR 8207‐UMET‐Unité Matériaux et TransformationsLilleFrance
| | - P. Cordier
- Univ. Lille, CNRS, INRA, ENSCL, UMR 8207‐UMET‐Unité Matériaux et TransformationsLilleFrance
| | - A. Mussi
- Univ. Lille, CNRS, INRA, ENSCL, UMR 8207‐UMET‐Unité Matériaux et TransformationsLilleFrance
| | - J. Girard
- Department of Geology and GeophysicsYale UniversityNew HavenConnecticutUSA
| | - S. Karato
- Department of Geology and GeophysicsYale UniversityNew HavenConnecticutUSA
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8
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Girard J, Amulele G, Farla R, Mohiuddin A, Karato SI. Shear deformation of bridgmanite and magnesiowüstite aggregates at lower mantle conditions. Science 2015; 351:144-7. [PMID: 26721681 DOI: 10.1126/science.aad3113] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 11/12/2015] [Indexed: 11/02/2022]
Abstract
Rheological properties of the lower mantle have strong influence on the dynamics and evolution of Earth. By using the improved methods of quantitative deformation experiments at high pressures and temperatures, we deformed a mixture of bridgmanite and magnesiowüstite under the shallow lower mantle conditions. We conducted experiments up to about 100% strain at a strain rate of about 3 × 10(-5) second(-1). We found that bridgmanite is substantially stronger than magnesiowüstite and that magnesiowüstite largely accommodates the strain. Our results suggest that strain weakening and resultant shear localization likely occur in the lower mantle. This would explain the preservation of long-lived geochemical reservoirs and the lack of seismic anisotropy in the majority of the lower mantle except the boundary layers.
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Affiliation(s)
- Jennifer Girard
- Department of Geology and Geophysics, Yale University, New Haven, CT, USA
| | - George Amulele
- Department of Geology and Geophysics, Yale University, New Haven, CT, USA
| | - Robert Farla
- Department of Geology and Geophysics, Yale University, New Haven, CT, USA
| | - Anwar Mohiuddin
- Department of Geology and Geophysics, Yale University, New Haven, CT, USA
| | - Shun-ichiro Karato
- Department of Geology and Geophysics, Yale University, New Haven, CT, USA.
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9
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Mao WL. High pressure: Compressed hydrogen heats up. NATURE MATERIALS 2015; 14:466-468. [PMID: 25707021 DOI: 10.1038/nmat4245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Wendy L Mao
- Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA, and at the Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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10
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Larrégola SA, Alonso JA, de la Peña-O’Shea VA, Sheptyakov D, Pomjakushin V, Fernandez-Díaz MT, Pedregosa JC. Localization and Impact of Pb-Non-Bonded Electronic Pair on the Crystal and Electronic Structure of Pb2YSbO6. Inorg Chem 2014; 53:5609-18. [DOI: 10.1021/ic500278y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebastián A. Larrégola
- Instituto de Investigaciones en Tecnología
Quimica (INTEQUI), Universidad Nacional de San Luis - CONICET, Chacabuco y Pedernera, 5700 San Luis, Argentina
| | - José A. Alonso
- Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco, 28049 Madrid, Spain
| | - Victor A. de la Peña-O’Shea
- Thermochemical Processes
Unit, IMDEA Energy Institute, c/Ramón de la Sagra 3, Parque
Tecnológico de Móstoles, 28935 Móstoles, Madrid, Spain
| | - Denis Sheptyakov
- Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, Switzerland
| | | | | | - José C. Pedregosa
- Instituto de Investigaciones en Tecnología
Quimica (INTEQUI), Universidad Nacional de San Luis - CONICET, Chacabuco y Pedernera, 5700 San Luis, Argentina
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Constraints on the Temperature and Composition of the Base of the Mantle. ACTA ACUST UNITED AC 2013. [DOI: 10.1029/gm072p0181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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12
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Knittle E. Static Compression Measurements of Equations of State. AGU REFERENCE SHELF 2013. [DOI: 10.1029/rf002p0098] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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14
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Kato T, Ohtani E, Morishima H, Yamazaki D, Suzuki A, Suto M, Kubo T, Kikegawa T, Shimomura O. In situ X ray observation of high-pressure phase transitions of MgSiO3and thermal expansion of MgSiO3perovskite at 25 GPa by double-stage multianvil system. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/95jb01688] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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O'Neill B, Jeanloz R. MgSiO3-FeSiO3-Al2O3in the Earth's lower mantle: Perovskite and garnet at 1200 km depth. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/94jb01752] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Christensen UR, Hofmann AW. Segregation of subducted oceanic crust in the convecting mantle. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/93jb03403] [Citation(s) in RCA: 428] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Yusa H, Akaogi M, Ito E. Calorimetric study of MgSiO3garnet and pyroxene: Heat capacities, transition enthalpies, and equilibrium phase relations in MgSiO3at high pressures and temperatures. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/92jb02862] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Fei Y, Mao HK. Static compression of Mg(OH)2to 78 GPa at high temperature and constraints on the equation of state of fluid H2O. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/93jb00701] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Wysession ME, Bartkó L, Wilson JB. Mapping the lowermost mantle using core-reflected shear waves. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/94jb00691] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lu R, Hofmeister AM, Wang Y. Thermodynamic properties of ferromagnesium silicate perovskites from vibrational spectroscopy. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/94jb00501] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Chiba A, Funamori N, Nakayama K, Ohishi Y, Bennington SM, Rastogi S, Shukla A, Tsuji K, Takenaka M. Pressure-induced structural change of intermediate-range order in poly(4-methyl-1-pentene) melt. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:021807. [PMID: 22463236 DOI: 10.1103/physreve.85.021807] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 01/01/2012] [Indexed: 05/31/2023]
Abstract
High-pressure in situ x-ray diffraction and specific-volume measurements on isotactic poly(4-methyl-1-pentene) melt have uncovered abrupt changes in the pressure dependence of microscopic structure as well as that of macroscopic density. The first sharp diffraction peak of the polymer melt, which is related to the intermediate-range order and is explained as resulting from the correlations between main chains, is suppressed at pressures less than 1 kbar. These changes in intermediate-range order show similarities to those seen in liquid-liquid or amorphous-amorphous transitions in simpler small molecule based systems, suggesting that this kind of phenomenon may occur in a wide range of materials.
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Affiliation(s)
- Ayano Chiba
- Department of Physics, Keio University, Yokohama 223-8522, Japan.
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Liu ZJ, Sun XW, Zhang CR, Hu JB, Song T, Qi JH. Elastic Tensor and Thermodynamic Property of Magnesium Silicate Perovskite from First-principles Calculations. CHINESE J CHEM PHYS 2011. [DOI: 10.1088/1674-0068/24/06/703-710] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yu YG, Wentzcovitch RM, Vinograd VL, Angel RJ. Thermodynamic properties of MgSiO3majorite and phase transitions near 660 km depth in MgSiO3and Mg2SiO4: A first principles study. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jb007912] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Abstract
Our knowledge of the structure of the Earth´s interior has been obtained by analysing seismic waves that travel in the Earth, and the reference Earth global models used by geophysicists are essentially seismological. Depth profiles of the seismic waves velocities reveal that the deep Earth is divided in several shells, separated by velocity and density discontinuities. The main discontinuity located at a depth of 2900 km corresponds to the transition between the mantle and the core. The Earth´s mantle can be further divided into the upper mantle and the lower mantle, with a transition zone characterised by two prominent increases in velocities observed at 410- and 660-km depths. This article will be focused on the mineral phases of the Earth´s mantle. The interpretation of seismological models in terms of chemical composition and temperature relies on the knowledge of the nature, structure and elastic properties of the candidate materials. We will describe to what extent recent advances in experimental mineral physics and X-ray diffraction have yielded essential knowledge on the structure and high-pressure high-temperature behaviour of pertinent materials, and major improvements in our understanding of the chemical and mineralogical composition of the Earth´s mantle.
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Tange Y, Takahashi E, Nishihara Y, Funakoshi KI, Sata N. Phase relations in the system MgO-FeO-SiO2to 50 GPa and 2000°C: An application of experimental techniques using multianvil apparatus with sintered diamond anvils. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jb005891] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Mosenfelder JL, Asimow PD, Frost DJ, Rubie DC, Ahrens TJ. The MgSiO3system at high pressure: Thermodynamic properties of perovskite, postperovskite, and melt from global inversion of shock and static compression data. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jb005900] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jed L. Mosenfelder
- Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
| | - Paul D. Asimow
- Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
| | - Daniel J. Frost
- Bayerisches Geoinstitut; Universität Bayreuth; Bayreuth Germany
| | - David C. Rubie
- Bayerisches Geoinstitut; Universität Bayreuth; Bayreuth Germany
| | - Thomas J. Ahrens
- Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
- Lindhurst Laboratory of Experimental Geophysics, Seismological Laboratory; California Institute of Technology; Pasadena California USA
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28
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Chen Q, Cheng XL, Yang XD. Influence of New Interaction Potential on MD Simulation of MgSiO3 Perovskite Thermodynamic Properties. CHINESE J CHEM PHYS 2007. [DOI: 10.1088/1674-0068/20/05/547-551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Li B, Liebermann RC. Indoor seismology by probing the Earth's interior by using sound velocity measurements at high pressures and temperatures. Proc Natl Acad Sci U S A 2007; 104:9145-50. [PMID: 17485673 PMCID: PMC1890461 DOI: 10.1073/pnas.0608609104] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The adiabatic bulk (K(S)) and shear (G) moduli of mantle materials at high pressure and temperature can be obtained directly by measuring compressional and shear wave velocities in the laboratory with experimental techniques based on physical acoustics. We present the application of the current state-of-the-art experimental techniques by using ultrasonic interferometry in conjunction with synchrotron x radiation to study the elasticity of olivine and pyroxenes and their high-pressure phases. By using these updated thermoelasticity data for these phases, velocity and density profiles for a pyrolite model are constructed and compared with radial seismic models. We conclude that pyrolite provides an adequate explanation of the major seismic discontinuities at 410- and 660-km depths, the gradient in the transition zone, as well as the velocities in the lower mantle, if the uncertainties in the modeling and the variations in different seismic models are considered. The characteristics of the seismic scaling factors in response to thermal anomalies suggest that anticorrelations between bulk sound and shear wave velocities, as well as the large positive density anomalies observed in the lower mantle, cannot be explained fully without invoking chemical variations.
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Affiliation(s)
- Baosheng Li
- Mineral Physics Institute and Department of Geosciences, Stony Brook University, Stony Brook, NY 11790, USA.
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30
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Liu ZJ, Sun XW, Yang XD, Cheng XL, Guo YD. Simulation of Melting Behavior of the MgSiO3 Perovskite Under Lower Mantle Conditions. CHINESE J CHEM PHYS 2006. [DOI: 10.1360/cjcp2006.19(4).311.4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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31
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Liu ZJ, Cheng XL, Zhang FP, Yang XD, Guo Y. Simulated Equations of State of MgSiO3 Perovskite. CHINESE J CHEM PHYS 2006. [DOI: 10.1360/cjcp2006.19(1).65.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Bovolo CI. The physical and chemical composition of the lower mantle. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2005; 363:2811-35. [PMID: 16286292 DOI: 10.1098/rsta.2005.1675] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This article reviews some of the recent advances made within the field of mineral physics. In order to link the observed seismic and density structures of the lower mantle with a particular mineral composition, knowledge of the thermodynamic properties of the candidate materials is required. Determining which compositional model best matches the observed data is difficult because of the wide variety of possible mineral structures and compositions. State-of-the-art experimental and analytical techniques have pushed forward our knowledge of mineral physics, yet certain properties, such as the elastic properties of lower mantle minerals at high pressures and temperatures, are difficult to determine experimentally and remain elusive. Fortunately, computational techniques are now sufficiently advanced to enable the prediction of these properties in a self-consistent manner, but more results are required.A fundamental question is whether or not the upper and lower mantles are mixing. Traditional models that involve chemically separate upper and lower mantles cannot yet be ruled out despite recent conflicting seismological evidence showing that subducting slabs penetrate deep into the lower mantle and that chemically distinct layers are, therefore, unlikely.Recent seismic tomography studies giving three-dimensional models of the seismic wave velocities in the Earth also base their interpretations on the thermodynamic properties of minerals. These studies reveal heterogeneous velocity and density anomalies in the lower mantle, which are difficult to reconcile with mineral physics data.
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Affiliation(s)
- C Isabella Bovolo
- University of Newcastle upon Tyne School of Civil Engineering & Geosciences Newcastle upon Tyne NE1 7RU, UK.
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33
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Li J, Struzhkin VV, Mao HK, Shu J, Hemley RJ, Fei Y, Mysen B, Dera P, Prakapenka V, Shen G. Electronic spin state of iron in lower mantle perovskite. Proc Natl Acad Sci U S A 2004; 101:14027-30. [PMID: 15377786 PMCID: PMC521114 DOI: 10.1073/pnas.0405804101] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The electronic spin state of iron in lower mantle perovskite is one of the fundamental parameters that governs the physics and chemistry of the most voluminous and massive shell in the Earth. We present experimental evidence for spin-pairing transition in aluminum-bearing silicate perovskite (Mg,Fe)(Si,Al)O(3) under the lower mantle pressures. Our results demonstrate that as pressure increases, iron in perovskite transforms gradually from the initial high-spin state toward the final low-spin state. At 100 GPa, both aluminum-free and aluminum-bearing samples exhibit a mixed spin state. The residual magnetic moment in the aluminum-bearing perovskite is significantly higher than that in its aluminum-free counterpart. The observed spin evolution with pressure can be explained by the presence of multiple iron species and the occurrence of partial spin-paring transitions in the perovskite. Pressure-induced spin-pairing transitions in the perovskite would have important bearing on the magnetic, thermoelastic, and transport properties of the lower mantle, and on the distribution of iron in the Earth's interior.
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Affiliation(s)
- Jie Li
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA
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34
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Saltzer RL, Stutzmann E, van der Hilst RD. Poisson's ratio in the lower mantle beneath Alaska: Evidence for compositional heterogeneity. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jb002712] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rebecca L. Saltzer
- Department of Earth, Atmospheric and Planetary Sciences; Massachusetts Institute of Technology; Cambridge Massachusetts USA
| | | | - Robert D. van der Hilst
- Department of Earth, Atmospheric and Planetary Sciences; Massachusetts Institute of Technology; Cambridge Massachusetts USA
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35
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Tsuchiya T. First-principles prediction of theP-V-Tequation of state of gold and the 660-km discontinuity in Earth's mantle. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2003jb002446] [Citation(s) in RCA: 177] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Taku Tsuchiya
- Department of Earth and Planetary Sciences; Tokyo Institute of Technology; Meguro, Tokyo Japan
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36
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Navrotsky A, Schoenitz M, Kojitani H, Xu H, Zhang J, Weidner DJ, Jeanloz R. Aluminum in magnesium silicate perovskite: Formation, structure, and energetics of magnesium-rich defect solid solutions. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jb002055] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexandra Navrotsky
- Thermochemistry Facility, Center for High Pressure Research, Department of Chemical Engineering and Materials Science; University of California; Davis California USA
| | - Mirko Schoenitz
- Thermochemistry Facility, Center for High Pressure Research, Department of Chemical Engineering and Materials Science; University of California; Davis California USA
| | - Hiroshi Kojitani
- Thermochemistry Facility, Center for High Pressure Research, Department of Chemical Engineering and Materials Science; University of California; Davis California USA
| | - Hongwu Xu
- Thermochemistry Facility, Center for High Pressure Research, Department of Chemical Engineering and Materials Science; University of California; Davis California USA
| | - Jianzhong Zhang
- Center for High Pressure Research, Department of Geosciences; State University of New York; Stony Brook New York USA
| | - Donald J. Weidner
- Center for High Pressure Research, Department of Geosciences; State University of New York; Stony Brook New York USA
| | - Raymond Jeanloz
- Department of Geology and Geophysics; University of California; Berkeley California USA
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37
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Panero WR, Benedetti LR, Jeanloz R. Equation of state of stishovite and interpretation of SiO2shock-compression data. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jb001663] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wendy R. Panero
- Department of Geological Sciences; University of Michigan; Ann Arbor Michigan USA
| | | | - Raymond Jeanloz
- Department of Earth and Planetary Science; University of California; Berkeley California USA
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38
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Brodholt JP, Oganov AR, Price GD. Computational mineral physics and the physical properties of perovskite. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2002; 360:2507-2520. [PMID: 12460478 DOI: 10.1098/rsta.2002.1078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The inherent uncertainties in modern first-principles calculations are reviewed using geophysically relevant examples. The elastic constants of perovskite at lower-mantle temperatures and pressures are calculated using ab initio molecular dynamics. These are used in conjunction with seismic tomographic models to estimate that the lateral temperature contrasts in the Earth's lower mantle are 800 K at a depth of 1000 km, and 1500 K at a depth of 2000 km. The effect of Al(3+) on the compressibility of MgSiO(3) perovskite is calculated using three different pseudopotentials. The results confirm earlier work and show that the compressibility of perovskites with Al(3+) substituted for both Si(4+) and Mg(2+) is very similar to the compressibility of Al(3+)-free perovskite. Even when 100% of the Si(4+) and Mg(2+) ions are replaced with Al(3+), the bulk modulus is only 7% less than that for Al(3+)-free perovskite. In contrast, perovskites where Al(3+) substitutes for Si(4+) only and that are charge balanced by oxygen vacancies do show higher compressibilities. When corrected to similar concentrations of Al(3+), the calculated compressibilities of the oxygen-vacancy-rich perovskites are in agreement with experimental results.
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Affiliation(s)
- John P Brodholt
- Department of Earth Sciences, University College London, Gower Street, UK
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39
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Tsuchiya T, Kawamura K. Ab initio study of pressure effect on elastic properties of crystalline Au. J Chem Phys 2002. [DOI: 10.1063/1.1429643] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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40
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Andrault D. Evaluation of (Mg,Fe) partitioning between silicate perovskite and magnesiowustite up to 120 GPa and 2300 K. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jb900362] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Dewaele A, Fiquet G, Andrault D, Hausermann D. P-V-T equation of state of periclase from synchrotron radiation measurements. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jb900364] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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42
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Karki BB, Stixrude L. Seismic velocities of major silicate and oxide phases of the lower mantle. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jb900069] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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43
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Abstract
Inferences of the chemical homogeneity of Earth's mantle depend on comparing laboratory-derived equations of state of mantle phases with seismically determined properties of the material in situ. A uniform chemical composition of the entire mantle has been found to be consistent with measurements, to date, of these properties for the end-member MgSiO3 perovskite phase. New pressure-volume-temperature data for silicate perovskite containing 5 mole percent Al2O3 has yielded different values of the equation of state parameters, with the bulk modulus being significantly smaller at lower mantle conditions than for aluminum-free perovskite, thus requiring adjustments in other components to match seismic observations.
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Affiliation(s)
- J Zhang
- Center for High Pressure Research and Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794, USA
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44
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Sinelnikov YD, Chen G, Neuville DR, Vaughan MT, Liebermann RC. Ultrasonic shear wave velocities of MgSiO3 perovskite at 8 GPa and 800 K and lower mantle composition. Science 1998; 281:677-9. [PMID: 9685256 DOI: 10.1126/science.281.5377.677] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Ultrasonic interferometric measurements of the shear elastic properties of MgSiO3 perovskite were conducted on three polycrystalline specimens at conditions up to pressures of 8 gigapascals and temperatures of 800 kelvin. The acoustic measurements produced the pressure (P) and temperature (T) derivatives of the shear modulus (G), namely ( partial differentialG/ partial differentialP)T = 1.8 +/- 0.4 and ( partial differentialG/ partial differentialT)P = -2.9 +/- 0.3 x 10(-2) gigapascals per kelvin. Combining these derivatives with the derivatives that were measured for the bulk modulus and thermal expansion of MgSiO3 perovskite provided data that suggest lower mantle compositions between pyrolite and C1 carbonaceous chondrite and a lower mantle potential temperature of 1500 +/- 200 kelvin.
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Affiliation(s)
- YD Sinelnikov
- Y. D. Sinelnikov and R. C. Liebermann, Center for High Pressure Research and Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794-2100, USA. G. Chen and M. T. Vaughan, Center for High Pressure Research and
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45
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46
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Geodynamically consistent seismic velocity predictions at the base of the mantle. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/gd028p0209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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47
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Lay T, Williams Q, Garnero EJ, Kellogg L, Wysession ME. Seismic wave anisotropy in the D″ region and its implications. THE CORE‐MANTLE BOUNDARY REGION 1998. [DOI: 10.1029/gd028p0299] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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48
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Abstract
High-pressure diamond-cell experiments indicate that the iron-magnesium partitioning between (Fe,Mg)SiO3-perovskite and magnesiowustite in Earth's lower mantle depends on the pressure, temperature, bulk iron/magnesium ratio, and ferric iron content. The perovskite stability field expands with increasing pressure and temperature. The ferric iron component preferentially dissolves in perovskite and raises the apparent total iron content but had little effect on the partitioning of the ferrous iron. The ferrous iron depletes in perovskite at the top of the lower mantle and gradually increases at greater depth. These changes in iron-magnesium composition should affect geochemical and geophysical properties of the deep interior.
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Affiliation(s)
- H Mao
- Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015-1305 USA
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49
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Funamori N, Yagi T, Miyajima N, Fujino K. Transformation in Garnet from Orthorhombic Perovskite to LiNbO3 Phase on Release of Pressure. Science 1997; 275:513-5. [PMID: 8999791 DOI: 10.1126/science.275.5299.513] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
High-pressure in situ x-ray diffraction and transmission electron microscopy on quenched samples show that natural garnet transforms to orthorhombic perovskite (and minor coexisting phases) containing increasing amounts of aluminum with increasing pressure. This suggests that the perovskite is the dominant host mineral for aluminum in Earth's lower mantle. Orthorhombic perovskite is quenched from approximately 35 gigapascals but, because of the increased aluminum content, transforms to the LiNbO3 structure upon quenching from approximately 60 gigapascals.
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Affiliation(s)
- N Funamori
- N. Funamori and T. Yagi, Institute for Solid State Physics, University of Tokyo, Minato-ku 106, Japan. N. Miyajima and K. Fujino, Department of Earth and Planetary Sciences, Hokkaido University, Sapporo 060, Japan
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50
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Affiliation(s)
- Quentin Williams
- Earth Sciences Board and Institute of Tectonics, University of California, Santa Cruz, CA 95064, USA
| | - Edward J. Garnero
- Earth Sciences Board and Institute of Tectonics, University of California, Santa Cruz, CA 95064, USA
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