1
|
Mopoung K, Ning W, Zhang M, Ji F, Mukhuti K, Engelkamp H, Christianen PCM, Singh U, Klarbring J, Simak SI, Abrikosov IA, Gao F, Buyanova IA, Chen WM, Puttisong Y. Understanding Antiferromagnetic Coupling in Lead-Free Halide Double Perovskite Semiconductors. J Phys Chem C Nanomater Interfaces 2024; 128:5313-5320. [PMID: 38567374 PMCID: PMC10982993 DOI: 10.1021/acs.jpcc.3c08129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/05/2024] [Accepted: 03/05/2024] [Indexed: 04/04/2024]
Abstract
Solution-processable semiconductors with antiferromagnetic (AFM) order are attractive for future spintronics and information storage technology. Halide perovskites containing magnetic ions have emerged as multifunctional materials, demonstrating a cross-link between structural, optical, electrical, and magnetic properties. However, stable optoelectronic halide perovskites that are antiferromagnetic remain sparse, and the critical design rules to optimize magnetic coupling still must be developed. Here, we combine the complementary magnetometry and electron-spin-resonance experiments, together with first-principles calculations to study the antiferromagnetic coupling in stable Cs2(Ag:Na)FeCl6 bulk semiconductor alloys grown by the hydrothermal method. We show the importance of nonmagnetic monovalence ions at the BI site (Na/Ag) in facilitating the superexchange interaction via orbital hybridization, offering the tunability of the Curie-Weiss parameters between -27 and -210 K, with a potential to promote magnetic frustration via alloying the nonmagnetic BI site (Ag:Na ratio). Combining our experimental evidence with first-principles calculations, we draw a cohesive picture of the material design for B-site-ordered antiferromagnetic halide double perovskites.
Collapse
Affiliation(s)
- Kunpot Mopoung
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Weihua Ning
- Institute
of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, P.R. China
| | - Muyi Zhang
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Fuxiang Ji
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Kingshuk Mukhuti
- High
Field Magnet Laboratory (HFML - EMFL), Radboud
University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
| | - Hans Engelkamp
- High
Field Magnet Laboratory (HFML - EMFL), Radboud
University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
| | - Peter C. M. Christianen
- High
Field Magnet Laboratory (HFML - EMFL), Radboud
University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
| | - Utkarsh Singh
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Johan Klarbring
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Sergei I. Simak
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
- Department
of Physics and Astronomy, Uppsala University, Uppsala SE-75120, Sweden
| | - Igor A. Abrikosov
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Feng Gao
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Irina A. Buyanova
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | - Weimin M. Chen
- Department
of Physics (IFM), Linköping University, Linköping 583 30, Sweden
| | | |
Collapse
|
2
|
Baldwin WJ, Liang X, Klarbring J, Dubajic M, Dell'Angelo D, Sutton C, Caddeo C, Stranks SD, Mattoni A, Walsh A, Csányi G. Dynamic Local Structure in Caesium Lead Iodide: Spatial Correlation and Transient Domains. Small 2024; 20:e2303565. [PMID: 37736694 DOI: 10.1002/smll.202303565] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/31/2023] [Indexed: 09/23/2023]
Abstract
Metal halide perovskites are multifunctional semiconductors with tunable structures and properties. They are highly dynamic crystals with complex octahedral tilting patterns and strongly anharmonic atomic behavior. In the higher temperature, higher symmetry phases of these materials, several complex structural features are observed. The local structure can differ greatly from the average structure and there is evidence that dynamic 2D structures of correlated octahedral motion form. An understanding of the underlying complex atomistic dynamics is, however, still lacking. In this work, the local structure of the inorganic perovskite CsPbI3 is investigated using a new machine learning force field based on the atomic cluster expansion framework. Through analysis of the temporal and spatial correlation observed during large-scale simulations, it is revealed that the low frequency motion of octahedral tilts implies a double-well effective potential landscape, even well into the cubic phase. Moreover, dynamic local regions of lower symmetry are present within both higher symmetry phases. These regions are planar and the length and timescales of the motion are reported. Finally, the spatial arrangement of these features and their interactions are investigated and visualized, providing a comprehensive picture of local structure in the higher symmetry phases.
Collapse
Affiliation(s)
- William J Baldwin
- Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
| | - Xia Liang
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
| | - Johan Klarbring
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Milos Dubajic
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, CB3 0AS, UK
| | | | - Christopher Sutton
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA
| | - Claudia Caddeo
- CNR-IOM, Unitá di Cagliari, Monserrato, Caligari, 09042, Italy
| | - Samuel D Stranks
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, CB3 0AS, UK
| | | | - Aron Walsh
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
| | - Gábor Csányi
- Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
| |
Collapse
|
3
|
Liang X, Klarbring J, Baldwin WJ, Li Z, Csányi G, Walsh A. Structural Dynamics Descriptors for Metal Halide Perovskites. J Phys Chem C Nanomater Interfaces 2023; 127:19141-19151. [PMID: 37791100 PMCID: PMC10544022 DOI: 10.1021/acs.jpcc.3c03377] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 08/03/2023] [Indexed: 10/05/2023]
Abstract
Metal halide perovskites have shown extraordinary performance in solar energy conversion technologies. They have been classified as "soft semiconductors" due to their flexible corner-sharing octahedral networks and polymorphous nature. Understanding the local and average structures continues to be challenging for both modeling and experiments. Here, we report the quantitative analysis of structural dynamics in time and space from molecular dynamics simulations of perovskite crystals. The compact descriptors provided cover a wide variety of structural properties, including octahedral tilting and distortion, local lattice parameters, molecular orientations, as well as their spatial correlation. To validate our methods, we have trained a machine learning force field (MLFF) for methylammonium lead bromide (CH3NH3PbBr3) using an on-the-fly training approach with Gaussian process regression. The known stable phases are reproduced, and we find an additional symmetry-breaking effect in the cubic and tetragonal phases close to the phase-transition temperature. To test the implementation for large trajectories, we also apply it to 69,120 atom simulations for CsPbI3 based on an MLFF developed using the atomic cluster expansion formalism. The structural dynamics descriptors and Python toolkit are general to perovskites and readily transferable to more complex compositions.
Collapse
Affiliation(s)
- Xia Liang
- Department
of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
| | - Johan Klarbring
- Department
of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
- Department
of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
| | - William J. Baldwin
- Department
of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.
| | - Zhenzhu Li
- Department
of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
| | - Gábor Csányi
- Department
of Engineering, University of Cambridge, Cambridge CB2 1PZ, U.K.
| | - Aron Walsh
- Department
of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
- Department
of Physics, Ewha Womans University, Seoul 03760, Korea
| |
Collapse
|
4
|
Mosquera-Lois I, Kavanagh SR, Klarbring J, Tolborg K, Walsh A. Imperfections are not 0 K: free energy of point defects in crystals. Chem Soc Rev 2023; 52:5812-5826. [PMID: 37565783 DOI: 10.1039/d3cs00432e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Defects determine many important properties and applications of materials, ranging from doping in semiconductors, to conductivity in mixed ionic-electronic conductors used in batteries, to active sites in catalysts. The theoretical description of defect formation in crystals has evolved substantially over the past century. Advances in supercomputing hardware, and the integration of new computational techniques such as machine learning, provide an opportunity to model longer length and time-scales than previously possible. In this Tutorial Review, we cover the description of free energies for defect formation at finite temperatures, including configurational (structural, electronic, spin) and vibrational terms. We discuss challenges in accounting for metastable defect configurations, progress such as machine learning force fields and thermodynamic integration to directly access entropic contributions, and bottlenecks in going beyond the dilute limit of defect formation. Such developments are necessary to support a new era of accurate defect predictions in computational materials chemistry.
Collapse
Affiliation(s)
- Irea Mosquera-Lois
- Thomas Young Centre & Department of Materials, Imperial College London, London SW7 2AZ, UK.
| | - Seán R Kavanagh
- Thomas Young Centre & Department of Materials, Imperial College London, London SW7 2AZ, UK.
- Thomas Young Centre & Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Johan Klarbring
- Thomas Young Centre & Department of Materials, Imperial College London, London SW7 2AZ, UK.
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
| | - Kasper Tolborg
- Thomas Young Centre & Department of Materials, Imperial College London, London SW7 2AZ, UK.
- I-X, Imperial College London, London W12 0BZ, UK
| | - Aron Walsh
- Thomas Young Centre & Department of Materials, Imperial College London, London SW7 2AZ, UK.
- Department of Physics, Ewha Womans University, Seoul 03760, Korea
| |
Collapse
|
5
|
Zhang B, Klarbring J, Ji F, Simak SI, Abrikosov IA, Gao F, Rudko GY, Chen WM, Buyanova IA. Lattice Dynamics and Electron-Phonon Coupling in Double Perovskite Cs 2NaFeCl 6. J Phys Chem C Nanomater Interfaces 2023; 127:1908-1916. [PMID: 36761233 PMCID: PMC9900640 DOI: 10.1021/acs.jpcc.2c07493] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 01/05/2023] [Indexed: 06/18/2023]
Abstract
Phonon-phonon and electron/exciton-phonon coupling play a vitally important role in thermal, electronic, as well as optical properties of metal halide perovskites. In this work, we evaluate phonon anharmonicity and coupling between electronic and vibrational excitations in novel double perovskite Cs2NaFeCl6 single crystals. By employing comprehensive Raman measurements combined with first-principles theoretical calculations, we identify four Raman-active vibrational modes. Polarization properties of these modes imply Fm3̅m symmetry of the lattice, indicative for on average an ordered distribution of Fe and Na atoms in the lattice. We further show that temperature dependence of the Raman modes, such as changes in the phonon line width and their energies, suggests high phonon anharmonicity, typical for double perovskite materials. Resonant multiphonon Raman scattering reveals the presence of high-lying band states that mediate strong electron-phonon coupling and give rise to intense nA 1g overtones up to the fifth order. Strong electron-phonon coupling in Cs2NaFeCl6 is also concluded based on the Urbach tail analysis of the absorption coefficient and the calculated Fröhlich coupling constant. Our results, therefore, suggest significant impacts of phonon-phonon and electron-phonon interactions on electronic properties of Cs2NaFeCl6, important for potential applications of this novel material.
Collapse
Affiliation(s)
- Bin Zhang
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | - Johan Klarbring
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | | | - Sergei I. Simak
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
- Department
of Physics and Astronomy, Uppsala University, UppsalaSE-75120, Sweden
| | - Igor A. Abrikosov
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | - Feng Gao
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | - Galyna Yu Rudko
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | - Weimin M. Chen
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| | - Irina A. Buyanova
- Department
of Physics, Chemistry and Biology, Linköping
University, LinköpingSE-58183, Sweden
| |
Collapse
|
6
|
Cohen A, Brenner TM, Klarbring J, Sharma R, Fabini DH, Korobko R, Nayak PK, Hellman O, Yaffe O. Diverging Expressions of Anharmonicity in Halide Perovskites. Adv Mater 2022; 34:e2107932. [PMID: 35076969 DOI: 10.1002/adma.202107932] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Lead-based halide perovskite crystals are shown to have strongly anharmonic structural dynamics. This behavior is important because it may be the origin of their exceptional photovoltaic properties. The double perovskite, Cs2 AgBiBr6 , has been recently studied as a lead-free alternative for optoelectronic applications. However, it does not exhibit the excellent photovoltaic activity of the lead-based halide perovskites. Therefore, to explore the correlation between the anharmonic structural dynamics and optoelectronic properties in lead-based halide perovskites, the structural dynamics of Cs2 AgBiBr6 are investigated and are compared to its lead-based analog, CsPbBr3 . Using temperature-dependent Raman measurements, it is found that both materials are indeed strongly anharmonic. Nonetheless, the expression of their anharmonic behavior is markedly different. Cs2 AgBiBr6 has well-defined normal modes throughout the measured temperature range, while CsPbBr3 exhibits a complete breakdown of the normal-mode picture above 200 K. It is suggested that the breakdown of the normal-mode picture implies that the average crystal structure may not be a proper starting point to understand the electronic properties of the crystal. In addition to our main findings, an unreported phase of Cs2 AgBiBr6 is also discovered below ≈37 K.
Collapse
Affiliation(s)
- Adi Cohen
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Thomas M Brenner
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Rituraj Sharma
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Douglas H Fabini
- Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany
| | - Roman Korobko
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Pabitra K Nayak
- Tata Institute of Fundamental Research, Hyderabad, 500046, India
| | - Olle Hellman
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Omer Yaffe
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| |
Collapse
|
7
|
Ji F, Klarbring J, Wang F, Ning W, Wang L, Yin C, Figueroa JSM, Christensen CK, Etter M, Ederth T, Sun L, Simak SI, Abrikosov IA, Gao F. Lead-Free Halide Double Perovskite Cs 2 AgBiBr 6 with Decreased Band Gap. Angew Chem Int Ed Engl 2020; 59:15191-15194. [PMID: 32412132 PMCID: PMC7496408 DOI: 10.1002/anie.202005568] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Indexed: 01/06/2023]
Abstract
Environmentally friendly halide double perovskites with improved stability are regarded as a promising alternative to lead halide perovskites. The benchmark double perovskite, Cs2AgBiBr6, shows attractive optical and electronic features, making it promising for high‐efficiency optoelectronic devices. However, the large band gap limits its further applications, especially for photovoltaics. Herein, we develop a novel crystal‐engineering strategy to significantly decrease the band gap by approximately 0.26 eV, reaching the smallest reported band gap of 1.72 eV for Cs2AgBiBr6 under ambient conditions. The band‐gap narrowing is confirmed by both absorption and photoluminescence measurements. Our first‐principles calculations indicate that enhanced Ag–Bi disorder has a large impact on the band structure and decreases the band gap, providing a possible explanation of the observed band‐gap narrowing effect. This work provides new insights for achieving lead‐free double perovskites with suitable band gaps for optoelectronic applications.
Collapse
Affiliation(s)
- Fuxiang Ji
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Johan Klarbring
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Feng Wang
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Weihua Ning
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Linqin Wang
- Department of Chemistry, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - Chunyang Yin
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | | | | | - Martin Etter
- Deutsches Elektronen-Synchrotron (DESY), 22607, Hamburg, Germany
| | - Thomas Ederth
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Licheng Sun
- Department of Chemistry, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.,State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, 116024, Dalian, China
| | - Sergei I Simak
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| | - Igor A Abrikosov
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden.,Materials Modeling and Development Laboratory, National University of Science and Technology "MISIS", Leninskii pr 4, 119049, Moscow, Russia
| | - Feng Gao
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, 58183, Linköping, Sweden
| |
Collapse
|
8
|
Klarbring J, Hellman O, Abrikosov IA, Simak SI. Anharmonicity and Ultralow Thermal Conductivity in Lead-Free Halide Double Perovskites. Phys Rev Lett 2020; 125:045701. [PMID: 32794779 DOI: 10.1103/physrevlett.125.045701] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
The lead-free halide double perovskite class of materials offers a promising venue for resolving issues related to toxicity of Pb and long-term stability of the lead-containing halide perovskites. We present a first-principles study of the lattice vibrations in Cs_{2}AgBiBr_{6}, the prototypical compound in this class and show that the lattice dynamics of Cs_{2}AgBiBr_{6} is highly anharmonic, largely in regards to tilting of AgBr_{6} and BiBr_{6} octahedra. Using an energy- and temperature-dependent phonon spectral function, we then show how the experimentally observed cubic-to-tetragonal phase transformation is caused by the collapse of a soft phonon branch. We finally reveal that the softness and anharmonicity of Cs_{2}AgBiBr_{6} yield an ultralow thermal conductivity, unexpected of high-symmetry cubic structures.
Collapse
Affiliation(s)
- Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
| | - Olle Hellman
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
| | - Igor A Abrikosov
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
- Materials Modeling and Development Laboratory, National University of Science and Technology (NUST) "MISIS", 119049 Moscow, Russia
| | - Sergei I Simak
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
| |
Collapse
|
9
|
Ji F, Klarbring J, Wang F, Ning W, Wang L, Yin C, Figueroa JSM, Christensen CK, Etter M, Ederth T, Sun L, Simak SI, Abrikosov IA, Gao F. Lead‐Free Halide Double Perovskite Cs
2
AgBiBr
6
with Decreased Band Gap. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005568] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Fuxiang Ji
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Johan Klarbring
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Feng Wang
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Weihua Ning
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Linqin Wang
- Department of Chemistry KTH Royal Institute of Technology 10044 Stockholm Sweden
| | - Chunyang Yin
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | | | | | - Martin Etter
- Deutsches Elektronen-Synchrotron (DESY) 22607 Hamburg Germany
| | - Thomas Ederth
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Licheng Sun
- Department of Chemistry KTH Royal Institute of Technology 10044 Stockholm Sweden
- State Key Laboratory of Fine Chemicals Institute of Artificial Photosynthesis DUT-KTH Joint Education and Research Centre on Molecular Devices Dalian University of Technology 116024 Dalian China
| | - Sergei I. Simak
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| | - Igor A. Abrikosov
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
- Materials Modeling and Development Laboratory National University of Science and Technology “MISIS” Leninskii pr 4 119049 Moscow Russia
| | - Feng Gao
- Department of Physics Chemistry, and Biology (IFM) Linköping University 58183 Linköping Sweden
| |
Collapse
|
10
|
Spektor K, Crichton WA, Filippov S, Klarbring J, Simak SI, Fischer A, Häussermann U. Na-Ni-H Phase Formation at High Pressures and High Temperatures: Hydrido Complexes [NiH 5] 3- Versus the Perovskite NaNiH 3. ACS Omega 2020; 5:8730-8743. [PMID: 32337435 PMCID: PMC7178781 DOI: 10.1021/acsomega.0c00239] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/19/2020] [Indexed: 05/28/2023]
Abstract
The Na-Ni-H system was investigated by in situ synchrotron diffraction studies of reaction mixtures NaH-Ni-H2 at around 5, 10, and 12 GPa. The existence of ternary hydrogen-rich hydrides with compositions Na3NiH5 and NaNiH3, where Ni attains the oxidation state II, is demonstrated. Upon heating at ∼5 GPa, face-centered cubic (fcc) Na3NiH5 forms above 430 °C. Upon cooling, it undergoes a rapid and reversible phase transition at 330 °C to an orthorhombic (Cmcm) form. Upon pressure release, Na3NiH5 further transforms into its recoverable Pnma form whose structure was elucidated from synchrotron powder diffraction data, aided by first-principles density functional theory (DFT) calculations. Na3NiH5 features previously unknown square pyramidal 18-electron complexes NiH5 3-. In the high temperature fcc form, metal atoms are arranged as in the Heusler structure, and ab initio molecular dynamics simulations suggest that the complexes are dynamically disordered. The Heusler-type metal partial structure is essentially maintained in the low temperature Cmcm form, in which NiH5 3- complexes are ordered. It is considerably rearranged in the low pressure Pnma form. Experiments at 10 GPa showed an initial formation of fcc Na3NiH5 followed by the addition of the perovskite hydride NaNiH3, in which Ni(II) attains an octahedral environment by H atoms. NaNiH3 is recoverable at ambient pressures and represents the sole product of 12 GPa experiments. DFT calculations show that the decomposition of Na3NiH5 = NaNiH3 + 2 NaH is enthalpically favored at all pressures, suggesting that Na3NiH5 is metastable and its formation is kinetically favored. Ni-H bonding in metallic NaNiH3 is considered covalent, as in electron precise Na3NiH5, but delocalized in the polyanion [NiH3]-.
Collapse
Affiliation(s)
- Kristina Spektor
- ESRF,
The European Synchrotron Radiation Facility, F-38000 Grenoble, France
| | - Wilson A. Crichton
- ESRF,
The European Synchrotron Radiation Facility, F-38000 Grenoble, France
| | - Stanislav Filippov
- Theoretical
Physics Division, Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
- Department
of Materials and Environmental Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
| | - Johan Klarbring
- Theoretical
Physics Division, Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - Sergei I. Simak
- Theoretical
Physics Division, Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - Andreas Fischer
- Department
of Physics, Augsburg University, D-86135 Augsburg, Germany
| | - Ulrich Häussermann
- Department
of Materials and Environmental Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
| |
Collapse
|
11
|
Ekström E, le Febvrier A, Bourgeois F, Lundqvist B, Palisaitis J, Persson POÅ, Caballero-Calero O, Martín-González MS, Klarbring J, Simak SI, Eriksson F, Paul B, Eklund P. The effects of microstructure, Nb content and secondary Ruddlesden–Popper phase on thermoelectric properties in perovskite CaMn1−xNbxO3 (x = 0–0.10) thin films. RSC Adv 2020; 10:7918-7926. [PMID: 35492179 PMCID: PMC9049944 DOI: 10.1039/c9ra10007e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 02/14/2020] [Indexed: 11/21/2022] Open
Abstract
Reduction of thermal conductivity of sputtered CaMn1−xNbxO3 thin films by secondary Ruddlesden–Popper phase and grain size optimization.
Collapse
Affiliation(s)
- E. Ekström
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - A. le Febvrier
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | | | - B. Lundqvist
- Semiconductor Materials Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - J. Palisaitis
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - P. O. Å. Persson
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - O. Caballero-Calero
- IMN-Instituto de Micro y Nanotecnología
- IMN-CNM
- CSIC (CEI UAM+CSIC) Isaac Newton
- Madrid
- Spain
| | - M. S. Martín-González
- IMN-Instituto de Micro y Nanotecnología
- IMN-CNM
- CSIC (CEI UAM+CSIC) Isaac Newton
- Madrid
- Spain
| | - J. Klarbring
- Theoretical Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - S. I. Simak
- Theoretical Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - F. Eriksson
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - B. Paul
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| | - P. Eklund
- Thin Film Physics Division
- Department of Physics, Chemistry and Biology (IFM)
- Linköping University
- SE-58183 Linköping
- Sweden
| |
Collapse
|
12
|
Sangiovanni DG, Klarbring J, Smirnova D, Skripnyak NV, Gambino D, Mrovec M, Simak SI, Abrikosov IA. Superioniclike Diffusion in an Elemental Crystal: bcc Titanium. Phys Rev Lett 2019; 123:105501. [PMID: 31573311 DOI: 10.1103/physrevlett.123.105501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 06/20/2019] [Indexed: 06/10/2023]
Abstract
Recent theoretical investigations [A. B. Belonoshko et al. Nat. Geosci. 10, 312 (2017)1752-089410.1038/ngeo2892] revealed the occurrence of the concerted migration of several atoms in bcc Fe at inner-core temperatures and pressures. Here, we combine first-principles and semiempirical atomistic simulations to show that a diffusion mechanism analogous to the one predicted for bcc iron at extreme conditions is also operative and of relevance for the high-temperature bcc phase of pure Ti at ambient pressure. The mechanism entails a rapid collective movement of numerous (from two to dozens) neighbors along tangled closed-loop paths in defect-free crystal regions. We argue that this phenomenon closely resembles the diffusion behavior of superionics and liquid metals. Furthermore, we suggest that concerted migration is the atomistic manifestation of vanishingly small ω-mode phonon frequencies previously detected via neutron scattering and the mechanism underlying anomalously large and markedly non-Arrhenius self-diffusivities characteristic of bcc Ti.
Collapse
Affiliation(s)
- D G Sangiovanni
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
- ICAMS, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - J Klarbring
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - D Smirnova
- ICAMS, Ruhr-Universität Bochum, D-44780 Bochum, Germany
- Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia
| | - N V Skripnyak
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - D Gambino
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - M Mrovec
- ICAMS, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - S I Simak
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden
| |
Collapse
|
13
|
Abstract
Theoretical studies of phase stability in solid materials with dynamic disorder are challenging due to the failure of the standard picture of atoms vibrating around fixed equilibrium positions. Dynamically disordered solid materials show immense potential in applications. In particular, superionic conductors, where the disorder results in exceptionally high ionic conductivity, are very promising as solid state electrolytes in batteries and fuel cells. The biggest obstacle in living up to this potential is the limited stability of the dynamically disordered phases. Here, we outline a method to obtain the free energy of a dynamically disordered solid. It is based on a stress-strain thermodynamic integration on a deformation path between a mechanically stable ordered variant of the disordered phase, and the dynamically disordered phase itself. We show that the large entropy contribution associated with the dynamic disorder is captured in the behavior of the stress along the deformation path. We apply the method to Bi_{2}O_{3}, whose superionic δ phase is the fastest known solid oxide ion conductor. We accurately reproduce the experimental transition enthalpy and the critical temperature of the phase transition from the low temperature ground state α phase to the superionic δ phase. The method can be used for a first-principles description of the phase stability of superionic conductors and other materials with dynamic disorder, when the disordered phase can be connected to a stable phase through a continuous deformation path.
Collapse
Affiliation(s)
- Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
| | - Sergei I Simak
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
| |
Collapse
|
14
|
Spektor K, Crichton WA, Konar S, Filippov S, Klarbring J, Simak SI, Häussermann U. Unraveling Hidden Mg-Mn-H Phase Relations at High Pressures and Temperatures by in Situ Synchrotron Diffraction. Inorg Chem 2018; 57:1614-1622. [PMID: 29323885 DOI: 10.1021/acs.inorgchem.7b02968] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Mg-Mn-H system was investigated by in situ high pressure studies of reaction mixtures MgH2-Mn-H2. The formation conditions of two complex hydrides with composition Mg3MnH7 were established. Previously known hexagonal Mg3MnH7 (h-Mg3MnH7) formed at pressures 1.5-2 GPa and temperatures between 480 and 500 °C, whereas an orthorhombic form (o-Mg3MnH7) was obtained at pressures above 5 GPa and temperatures above 600 °C. The crystal structures of the polymorphs feature octahedral [Mn(I)H6]5- complexes and interstitial H-. Interstitial H- is located in trigonal bipyramidal and square pyramidal interstices formed by Mg2+ ions in h- and o-Mg3MnH7, respectively. The hexagonal form can be retained at ambient pressure, whereas the orthorhombic form upon decompression undergoes a distortion to monoclinic Mg3MnH7 (m-Mg3MnH7). The structure elucidation of o- and m-Mg3MnH7 was aided by first-principles density functional theory (DFT) calculations. Calculated enthalpy versus pressure relations predict m- and o-Mg3MnH7 to be more stable than h-Mg3MnH7 above 4.3 GPa. Phonon calculations revealed o-Mg3MnH7 to be dynamically unstable at pressures below 5 GPa, which explains its phase transition to m-Mg3MnH7 on decompression. The electronic structure of the quenchable polymorphs h- and m-Mg3MnH7 is very similar. The stable 18-electron complex [MnH6]5- is mirrored in the occupied states, and calculated band gaps are around 1.5 eV. The study underlines the significance of in situ investigations for mapping reaction conditions and understanding phase relations for hydrogen-rich complex transition metal hydrides.
Collapse
Affiliation(s)
- Kristina Spektor
- ESRF, The European Synchrotron Radiation Facility , F-38000 Grenoble, France
| | - Wilson A Crichton
- ESRF, The European Synchrotron Radiation Facility , F-38000 Grenoble, France
| | - Sumit Konar
- EaStChem School of Chemistry and Centre for Science at Extreme Conditions (CSEC), University of Edinburgh , Edinburgh EH9 3FJ, United Kingdom
| | - Stanislav Filippov
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83, Linköping, Sweden
| | - Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83, Linköping, Sweden
| | - Sergei I Simak
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83, Linköping, Sweden
| | - Ulrich Häussermann
- Department of Materials and Environmental Chemistry, Stockholm University , SE-10691 Stockholm, Sweden
| |
Collapse
|