1
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Gao L, Liu X, Bai J, Chen B, Wu M, Kong L, Bai Z, Li W. The crucial role of transient tri-coordinated oxygen in the flow of silicate melts. Phys Chem Chem Phys 2024; 26:7920-7930. [PMID: 38376943 DOI: 10.1039/d3cp06067e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
The transport properties of high-temperature silicate melts control magma flow and are crucial for a wide variety of industrial processes involving minerals. However, anomalous melt properties have been observed that cannot be explained by the traditional polymerization degree theory, which was derived based on quenched melts. Ab initio molecular dynamics (AIMD) simulations were conducted to investigate the flow mechanism of CaO-Al2O3-SiO2 melts under high temperature atmospheric conditions. By analyzing the dynamic structure of melted silicates and employing molecular orbital theory, we gained a fundamental understanding of the flow mechanism from a chemistry perspective. Transient tri-coordinated oxygen (TO) bonded with one Si and two Al atoms (SiOAl2) was found to be a pivotal intermediate in melt flow and atomic diffusion processes. Frequent chemical transition between TO in SiOAl2 and bridging oxygen (BO) dominated the fluidity of melted silicates. The presence of such transitions is facilitated by the unstable nature of [SiAlO2] 4-membered rings, which are susceptible to instability due to the intense repulsion between the O 2p lone pairs and the excessively bent O-Al-O angle. Additionally, the density of SiOAl2 type TO motif could serve as an indicator to determine the relationship between structure and fluidity. Our results challenge the traditional polymerization degree theory and suggest the need to reassess high-temperature liquid properties that govern processes in the Earth and industry by monitoring transient motifs.
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Affiliation(s)
- Longfei Gao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Xingchen Liu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Jin Bai
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Bo Chen
- Donostia International Physics Center, Paseo Manuel de Lardizabal, 4, 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain
| | - Min Wu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Lingxue Kong
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
| | - Zongqing Bai
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
| | - Wen Li
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P.R. China.
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2
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Liu Q, Wu C, Zhan L, Liu W, Yao S, Wang J, Ma Y. Effect of residual carbon on the phase transformation and microstructure evolution of alumina-mullite fibers prepared by sol-gel method. Ann Ital Chir 2022. [DOI: 10.1016/j.jeurceramsoc.2022.10.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Hashimoto H, Onodera Y, Tahara S, Kohara S, Yazawa K, Segawa H, Murakami M, Ohara K. Structure of alumina glass. Sci Rep 2022; 12:516. [PMID: 35017587 PMCID: PMC8752723 DOI: 10.1038/s41598-021-04455-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 12/16/2021] [Indexed: 11/10/2022] Open
Abstract
The fabrication of novel oxide glass is a challenging topic in glass science. Alumina (Al2O3) glass cannot be fabricated by a conventional melt–quenching method, since Al2O3 is not a glass former. We found that amorphous Al2O3 synthesized by the electrochemical anodization of aluminum metal shows a glass transition. The neutron diffraction pattern of the glass exhibits an extremely sharp diffraction peak owing to the significantly dense packing of oxygen atoms. Structural modeling based on X-ray/neutron diffraction and NMR data suggests that the average Al–O coordination number is 4.66 and confirms the formation of OAl3 triclusters associated with the large contribution of edge-sharing Al–O polyhedra. The formation of edge-sharing AlO5 and AlO6 polyhedra is completely outside of the corner-sharing tetrahedra motif in Zachariasen’s conventional glass formation concept. We show that the electrochemical anodization method leads to a new path for fabricating novel single-component oxide glasses.
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Affiliation(s)
- Hideki Hashimoto
- Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo, 192-0015, Japan.
| | - Yohei Onodera
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010 Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan.,Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Shuta Tahara
- Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, 1 Chihara, Nakahara cho, Nakagami-gun, Okinawa, 903-0213, Japan
| | - Shinji Kohara
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan. .,Department of Earth Science, ETH Zürich, Clausiusstrasse 25, 8092, Zürich, Switzerland.
| | - Koji Yazawa
- JEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo, 196-8558, Japan
| | - Hiroyo Segawa
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Motohiko Murakami
- Department of Earth Science, ETH Zürich, Clausiusstrasse 25, 8092, Zürich, Switzerland
| | - Koji Ohara
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Hyogo, 679-5198, Japan
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4
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Cendejas AJ, Sun H, Hayes SE, Kortshagen U, Thimsen E. Predicting plasma conditions necessary for synthesis of γ-Al 2O 3 nanocrystals. NANOSCALE 2021; 13:11387-11395. [PMID: 34160531 DOI: 10.1039/d1nr02488d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nonthermal plasma (NTP) offers a unique synthesis environment capable of producing nanocrystals of high melting point materials at relatively low gas temperatures. Despite the rapidly growing material library accessible through NTP synthesis, designing processes for new materials is predominantly empirically driven. Here, we report on the synthesis of both amorphous alumina and γ-Al2O3 nanocrystals and present a simple particle heating model that is suitable for predicting the plasma power necessary for crystallization. The heating model only requires the composition, temperature, and pressure of the background gas along with the reactor geometry to calculate the temperature of particles suspended in the plasma as a function of applied power. Complete crystallization of the nanoparticle population was observed when applied power was greater than the threshold where the calculated particle temperature is equal to the crystallization temperature of amorphous alumina.
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Affiliation(s)
- Austin J Cendejas
- Department of Energy, Environmental and Chemical Engineering, Washington University in Saint Louis, Saint Louis, Missouri, USA.
| | - He Sun
- Department of Chemistry, Washington University in Saint Louis, Saint Louis, Missouri, USA and Institute of Materials Science and Engineering, Washington University in Saint Louis, Saint Louis, Missouri, USA
| | - Sophia E Hayes
- Department of Chemistry, Washington University in Saint Louis, Saint Louis, Missouri, USA and Institute of Materials Science and Engineering, Washington University in Saint Louis, Saint Louis, Missouri, USA
| | - Uwe Kortshagen
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA
| | - Elijah Thimsen
- Department of Energy, Environmental and Chemical Engineering, Washington University in Saint Louis, Saint Louis, Missouri, USA. and Institute of Materials Science and Engineering, Washington University in Saint Louis, Saint Louis, Missouri, USA
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5
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Liu H, Yang F, Guo J, Xiang M, Bai H, Wang R, Su C. Facile combustion synthesis of amorphous Al 2O 3-coated LiMn 2O 4 cathode materials for high-performance Li-ion batteries. NEW J CHEM 2021. [DOI: 10.1039/d1nj01052b] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The unique Al2O3-coating layer can suppress the Mn dissolution and resist HF corrosion, hence stabilizing the crystal structure of spinel LiMn2O4 cathode materials.
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Affiliation(s)
- Honglei Liu
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Fangli Yang
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Junming Guo
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Mingwu Xiang
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Hongli Bai
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Rui Wang
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
| | - Changwei Su
- National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials
- Yunnan Minzu University
- Kunming
- China
- Key Laboratory of Green-chemistry Materials in University of Yunnan Province
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6
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7
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Wang Q, Li W, Hung I, Mentink-Vigier F, Wang X, Qi G, Wang X, Gan Z, Xu J, Deng F. Mapping the oxygen structure of γ-Al 2O 3 by high-field solid-state NMR spectroscopy. Nat Commun 2020; 11:3620. [PMID: 32680993 PMCID: PMC7367832 DOI: 10.1038/s41467-020-17470-4] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 06/30/2020] [Indexed: 11/29/2022] Open
Abstract
γ-Al2O3 is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of γ-Al2O3 is essential to tuning its physicochemical property, which still remains a great challenge. We report a strategy for the observation and determination of oxygen structure of γ-Al2O3 by using two-dimensional (2D) solid-state NMR spectroscopy at high field. 2D 17O double-quantum single-quantum homonuclear correlation NMR experiment is conducted at an ultra-high magnetic field of 35.2 T to reveal the spatial proximities between different oxygen species from the bulk to surface. Furthermore, 2D proton-detected 1H-17O heteronuclear correlation NMR experiments allow for a rapid identification and differentiation of surface hydroxyl groups and (sub-)surface oxygen species. Our experimental results demonstrate a non-random distribution of oxygen species in γ-Al2O3. γ-Al2O3 is widely used in catalytic processes, but understanding its detailed structure remains a challenge. The authors, using two-dimensional solid-state NMR spectroscopy at a high magnetic field, characterize the spatial proximity and connectivity between oxygen species from the bulk to the surface.
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Affiliation(s)
- Qiang Wang
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Wenzheng Li
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Ivan Hung
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Frederic Mentink-Vigier
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Xiaoling Wang
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Guodong Qi
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Xiang Wang
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL, 32310-3706, USA
| | - Jun Xu
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China. .,Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Feng Deng
- National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China
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8
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Nagashima H, Trébosc J, Kon Y, Sato K, Lafon O, Amoureux JP. Observation of Low-γ Quadrupolar Nuclei by Surface-Enhanced NMR Spectroscopy. J Am Chem Soc 2020; 142:10659-10672. [DOI: 10.1021/jacs.9b13838] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Hiroki Nagashima
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Julien Trébosc
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS - Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
- Univ. Lille, CNRS-2638, Fédération Chevreul, F-59000 Lille, France
| | - Yoshihiro Kon
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Olivier Lafon
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS - Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
- Institut Universitaire de France, 1 rue Descartes, F-75231 Paris, France
| | - Jean-Paul Amoureux
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS - Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France
- Bruker Biospin, 34 rue de l’industrie, F-67166 Wissembourg, France
- Riken NMR Science and Development Division, Yokohama, 230-0045 Kanagawa, Japan
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9
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Lee SK, Mun KY, Kim YH, Lhee J, Okuchi T, Lin JF. Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature. J Phys Chem Lett 2020; 11:2917-2924. [PMID: 32223166 DOI: 10.1021/acs.jpclett.0c00709] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
During the decompression of plastically deformed glasses at room temperature, some aspects of irreversible densification may be preserved. This densification has been primarily attributed to topological changes in glass networks. The changes in short-range structures like cation coordination numbers are often assumed to be relaxed upon decompression. Here the NMR results for aluminosilicate glass upon permanent densification up to 24 GPa reveal noticeable changes in the Al coordination number under pressure conditions as low as ∼6 GPa. A drastic increase in the highly coordinated Al fraction is evident over only a relatively narrow pressure range of up to ∼12 GPa, above which the coordination change becomes negligible up to 24 GPa. In contrast, Si coordination environments do not change, highlighting preferential coordination transformation during deformation. The observed trend in the coordination environment shows a remarkable similarity to the pressure-induced changes in the residual glass density, yielding a predictive relationship between the irreversible densification and the detailed structures under extreme compression. The results open a way to access the nature of plastic deformation in complex glasses at room temperature.
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Affiliation(s)
- Sung Keun Lee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
- Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Kwan Young Mun
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Yong-Hyun Kim
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Juho Lhee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Takuo Okuchi
- Institute for Planetary Materials, Okayama University, Misasa 682-0193, Japan
| | - Jung-Fu Lin
- Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, United States
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10
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Lee SK, Kim YH, Yi YS, Chow P, Xiao Y, Ji C, Shen G. Oxygen Quadclusters in SiO_{2} Glass above Megabar Pressures up to 160 GPa Revealed by X-Ray Raman Scattering. PHYSICAL REVIEW LETTERS 2019; 123:235701. [PMID: 31868455 DOI: 10.1103/physrevlett.123.235701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Indexed: 06/10/2023]
Abstract
As oxygen may occupy a major volume of oxides, a densification of amorphous oxides under extreme compression is dominated by reorganization of oxygen during compression. X-ray Raman scattering (XRS) spectra for SiO_{2} glass up to 1.6 Mbar reveal the evolution of heavily contracted oxygen environments characterized by a decrease in average O-O distance and the potential emergence of quadruply coordinated oxygen (oxygen quadcluster). Our results also reveal that the edge energies at the centers of gravity of the XRS features increase linearly with bulk density, yielding the first predictive relationship between the density and partial density of state of oxides above megabar pressures. The extreme densification paths with densified oxygen in amorphous oxides shed light upon the possible existence of stable melts in the planetary interiors.
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Affiliation(s)
- Sung Keun Lee
- School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
- Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Yong-Hyun Kim
- School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Yoo Soo Yi
- School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Paul Chow
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Yuming Xiao
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Cheng Ji
- Geophysical Laboratory, Carnegie Institution for Science, Argonne, Illinois 60439, USA
| | - Guoyin Shen
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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11
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Location of the Spinel Vacancies in γ‐Al
2
O
3. Angew Chem Int Ed Engl 2019; 58:15548-15552. [DOI: 10.1002/anie.201901497] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Indexed: 11/07/2022]
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12
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Affiliation(s)
- Roel Prins
- Institut für Chemie und Bioingenieurwissenschaften ETH Zürich Vladimir-Prelog-Weg 1 8093 Zürich Schweiz
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13
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Ganisetti S, Gaddam A, Kumar R, Balaji S, Mather GC, Pascual MJ, Fabian M, Siegel R, Senker J, Kharton VV, Guénolé J, Krishnan NMA, Ferreira JMF, Allu AR. Elucidating the formation of Al–NBO bonds, Al–O–Al linkages and clusters in alkaline-earth aluminosilicate glasses based on molecular dynamics simulations. Phys Chem Chem Phys 2019; 21:23966-23977. [DOI: 10.1039/c9cp04332b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Exploring the reasons for the initiation of Al–O–Al bond formation in alkali-earth alumino silicate glasses is a key topic in the glass-science community.
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Affiliation(s)
- Sudheer Ganisetti
- Department of Materials Science and Engineering
- Institute I
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Anuraag Gaddam
- Department of Materials and Ceramic Engineering
- CICECO
- University of Aveiro
- 3810–193 Aveiro
- Portugal
| | - Rajesh Kumar
- Department of Civil Engineering
- Indian Institute of Technology Delhi
- India 110016
| | - Sathravada Balaji
- Glass Division
- CSIR-Central Glass and Ceramic Research Institute
- Kolkata
- India
| | | | | | - Margit Fabian
- Centre for Energy Research
- Hungarian Academy of Sciences
- Hungary
| | - Renée Siegel
- Inorganic Chemistry III
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | - Jürgen Senker
- Inorganic Chemistry III
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | | | - Julien Guénolé
- Institute of Physical Metallurgy and Materials Physics
- RWTH Aachen University
- 52056 Aachen
- Germany
| | | | - José M. F. Ferreira
- Department of Civil Engineering
- Indian Institute of Technology Delhi
- India 110016
| | - Amarnath R. Allu
- Glass Division
- CSIR-Central Glass and Ceramic Research Institute
- Kolkata
- India
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14
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Li W, Wang Q, Xu J, Aussenac F, Qi G, Zhao X, Gao P, Wang C, Deng F. Probing the surface of γ-Al 2O 3 by oxygen-17 dynamic nuclear polarization enhanced solid-state NMR spectroscopy. Phys Chem Chem Phys 2018; 20:17218-17225. [PMID: 29900471 DOI: 10.1039/c8cp03132k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
γ-Al2O3 is an important catalyst and catalyst support of industrial interest. Its acid/base characteristics are correlated to the surface structure, which has always been an issue of concern. In this work, the complex (sub-)surface oxygen species on surface-selectively labelled γ-Al2O3 were probed by 17O dynamic nuclear polarization surface-enhanced NMR spectroscopy (DNP-SENS). Direct 17O MAS and indirect 1H-17O cross-polarization (CP)/MAS DNP experiments enable observation of the (sub-)surface bare oxygen species and hydroxyl groups. In particular, a two-dimensional (2D) 17O 3QMAS DNP spectrum was for the first time achieved for γ-Al2O3, in which two O(Al)4 and one O(Al)3 bare oxygen species were identified. The 17O isotropic chemical shifts (δcs) vary from 56.7 to 81.0 ppm and the quadrupolar coupling constants (CQ) range from 0.6 to 2.5 MHz for the three oxygen species. The coordinatively unsaturated O(Al)3 species is characterized by a higher field chemical shift (56.7 ppm) and the largest CQ value (2.5 MHz) among these oxygen sites. 2D 1H → 17O HETCOR DNP experiments allow us to discriminate three bridging (Aln)-μ2-OH and two terminal (Aln)-μ1-OH hydroxyl groups. The structural features of the bare oxygen species and hydroxyl groups are similar for the γ-Al2O3 samples isotopically labelled by 17O2 gas or H217O. The results presented here show that the combination of surface-selective labelling and DNP-SENS is an effective approach for characterizing oxides with complex surface species.
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Affiliation(s)
- Wenzheng Li
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China.
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