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Yanagisawa J, Aoyama T, Fujii K, Yashima M, Inaguma Y, Kuwabara A, Shitara K, Le Ouay B, Hayami S, Ohba M, Ohtani R. Strongly Enhanced Polarization in a Ferroelectric Crystal by Conduction-Proton Flow. J Am Chem Soc 2024; 146:1476-1483. [PMID: 38166110 DOI: 10.1021/jacs.3c10841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Ion conductors comprising noncentrosymmetric frameworks have emerged as new functional materials. However, strongly correlated polarity functionality and ion transport have not been achieved. Herein, we report a ferroelectric proton conductor, K2MnN(CN)4·H2O (1·H2O), exhibiting the strong correlation between its polar skeleton and conductive ions that generate anomalous ferroelectricity via the proton-bias phenomenon. The application of an electric field of ±1 kV/cm (0.1 Hz) on 1·H2O at 298 K produced the ferroelectricity (polarization = 1.5 × 104 μC/cm2), which was enhanced by the ferroelectric-skeleton-trapped conductive protons. Furthermore, the strong polarity-proton transport coupling of 1·H2O induced a proton-rectification-like directional ion-conductive behavior that could be adjusted by the magnitude and direction of DC electric fields. Moreover, 1·H2O exhibited reversible polarity switching between the polar 1·H2O and its dehydrated form, 1, with a centrosymmetric structure comprising an order-disorder-type transition of the nitrido-bridged chains.
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Affiliation(s)
- Junichi Yanagisawa
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takuya Aoyama
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-17 O-okayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yoshiyuki Inaguma
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya 456-8587, Japan
| | - Kazuki Shitara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya 456-8587, Japan
| | - Benjamin Le Ouay
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shinya Hayami
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Masaaki Ohba
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ryo Ohtani
- Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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2
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Ayu NIP, Takeiri F, Ogawa T, Kuwabara A, Hagihala M, Saito T, Kamiyama T, Kobayashi G. A new family of anti-perovskite oxyhydrides with tetrahedral GaO 4 polyanions. Dalton Trans 2023; 52:15420-15425. [PMID: 37366341 DOI: 10.1039/d3dt01555f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
New solid compounds A3-xGaO4H1-y (A = Sr, Ba; x ∼0.15, y ∼0.3), which are the first oxyhydrides containing gallium ions, have been synthesized by high-pressure synthesis. Powder X-ray and neutron diffraction experiments revealed that the series adopts an anti-perovskite structure consisting of hydride-anion-centered HA6 octahedra with tetrahedral GaO4 polyanions, wherein the A- and H-sites show partial defect. Formation energy calculations from the raw materials support that stoichiometric Ba3GaO4H is thermodynamically stable with a wide band gap. Annealing the A = Ba powder under flowing Ar and O2 gas suggests topochemical H- desorption and O2-/H- exchange reactions, respectively.
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Affiliation(s)
- Nur Ika Puji Ayu
- Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
| | - Fumitaka Takeiri
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
- Department of Materials Molecular Science, Institute for Molecular Science, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
- Solid State Chemistry Laboratory, Cluster for Pioneering Research (CPR), RIKEN, Wako 351-0198, Japan.
| | - Takafumi Ogawa
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Masato Hagihala
- Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
| | - Takashi Saito
- Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
| | - Takashi Kamiyama
- Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- China Spallation Neutron Source Science Center, Dongguan, 523803, China
| | - Genki Kobayashi
- SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
- Department of Materials Molecular Science, Institute for Molecular Science, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
- Solid State Chemistry Laboratory, Cluster for Pioneering Research (CPR), RIKEN, Wako 351-0198, Japan.
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3
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Irvine GJ, Smith RI, Jones MO, Irvine JTS. Order-disorder and ionic conductivity in calcium nitride-hydride. Nat Commun 2023; 14:4389. [PMID: 37474517 PMCID: PMC10359262 DOI: 10.1038/s41467-023-40025-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 07/05/2023] [Indexed: 07/22/2023] Open
Abstract
Recently nitrogen-hydrogen compounds have successfully been applied as co-catalysts for mild conditions ammonia synthesis. Ca2NH was shown to act as a H2 sink during reaction, with H atoms from its lattice being incorporated into the NH3(g) product. Thus the ionic transport and diffusion properties of the N-H co-catalyst are fundamentally important to understanding and developing such syntheses. Here we show hydride ion conduction in these materials. Two distinct calcium nitride-hydride Ca2NH phases, prepared via different synthetic paths are found to show dramatically different properties. One phase (β) shows fast hydride ionic conduction properties (0.08 S/cm at 600 °C), on a par with the best binary ionic hydrides and 10 times higher than CaH2, whilst the other (α) is 100 times less conductive. An in situ combined analysis techniques reveals that the effective β-phase conducts ions via a vacancy-mediated phenomenon in which the charge carrier concentration is dependent on the ion concentration in the secondary site and by extension the vacancy concentration in the main site.
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Affiliation(s)
- G J Irvine
- Chemistry, University of St Andrews, St Andrews, Scotland, KY16 9ST, UK.
| | - Ronald I Smith
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Oxford, England, OX11 0QX, UK
| | - M O Jones
- Chemistry, University of St Andrews, St Andrews, Scotland, KY16 9ST, UK
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Oxford, England, OX11 0QX, UK
| | - J T S Irvine
- Chemistry, University of St Andrews, St Andrews, Scotland, KY16 9ST, UK.
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Oxford, England, OX11 0QX, UK.
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4
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Yasui Y, Tansho M, Fujii K, Sakuda Y, Goto A, Ohki S, Mogami Y, Iijima T, Kobayashi S, Kawaguchi S, Osaka K, Ikeda K, Otomo T, Yashima M. Hidden chemical order in disordered Ba 7Nb 4MoO 20 revealed by resonant X-ray diffraction and solid-state NMR. Nat Commun 2023; 14:2337. [PMID: 37095089 PMCID: PMC10126145 DOI: 10.1038/s41467-023-37802-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 03/30/2023] [Indexed: 04/26/2023] Open
Abstract
The chemical order and disorder of solids have a decisive influence on the material properties. There are numerous materials exhibiting chemical order/disorder of atoms with similar X-ray atomic scattering factors and similar neutron scattering lengths. It is difficult to investigate such order/disorder hidden in the data obtained from conventional diffraction methods. Herein, we quantitatively determined the Mo/Nb order in the high ion conductor Ba7Nb4MoO20 by a technique combining resonant X-ray diffraction, solid-state nuclear magnetic resonance (NMR) and first-principle calculations. NMR provided direct evidence that Mo atoms occupy only the M2 site near the intrinsically oxygen-deficient ion-conducting layer. Resonant X-ray diffraction determined the occupancy factors of Mo atoms at the M2 and other sites to be 0.50 and 0.00, respectively. These findings provide a basis for the development of ion conductors. This combined technique would open a new avenue for in-depth investigation of the hidden chemical order/disorder in materials.
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Affiliation(s)
- Yuta Yasui
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Masataka Tansho
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Yuichi Sakuda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Atsushi Goto
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Shinobu Ohki
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Yuuki Mogami
- NMR Station, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Takahiro Iijima
- Institute of Arts and Sciences, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata, 990-8560, Japan
| | - Shintaro Kobayashi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Shogo Kawaguchi
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Keiichi Osaka
- Industrial Application and Partnership Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- J-PARC Center, High Energy Accelerator Research Organization (KEK), 2-4 Shirakata-Shirane, Tokai, Ibaraki, 319-1106, Japan
- School of High Energy Accelerator Science, The Graduate University for Advanced Studies, 203-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
- Graduate School of Science and Engineering, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
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5
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Zhang W, Cui J, Wang S, Cao H, Wu A, Xia Y, Jiang Q, Guo J, He T, Chen P. Deforming lanthanum trihydride for superionic conduction. Nature 2023; 616:73-76. [PMID: 37020005 DOI: 10.1038/s41586-023-05815-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 02/08/2023] [Indexed: 04/07/2023]
Abstract
With strong reducibility and high redox potential, the hydride ion (H-) is a reactive hydrogen species and an energy carrier. Materials that conduct pure H- at ambient conditions will be enablers of advanced clean energy storage and electrochemical conversion technologies1,2. However, rare earth trihydrides, known for fast H migration, also exhibit detrimental electronic conductivity3-5. Here we show that by creating nanosized grains and defects in the lattice, the electronic conductivity of LaHx can be suppressed by more than five orders of magnitude. This transforms LaHx to a superionic conductor at -40 °C with a record high H- conductivity of 1.0 × 10-2 S cm-1 and a low diffusion barrier of 0.12 eV. A room-temperature all-solid-state hydride cell is demonstrated.
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Affiliation(s)
- Weijin Zhang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Jirong Cui
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Shangshang Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Hujun Cao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China.
| | - Anan Wu
- Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, P. R. China
| | - Yuanhua Xia
- Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, P. R. China
| | - Qike Jiang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Jianping Guo
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Teng He
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China
| | - Ping Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, P. R. China.
- State Key Laboratory of Catalysis, Dalian, P. R. China.
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Okamoto K, Takeiri F, Imai Y, Yonemura M, Saito T, Ikeda K, Otomo T, Kamiyama T, Kobayashi G. Impact of Na Concentration on the Phase Transition Behavior and H - Conductivities in the Ba-Li-Na-H-O Oxyhydride System. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 10:e2203541. [PMID: 36382556 PMCID: PMC9811434 DOI: 10.1002/advs.202203541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/23/2022] [Indexed: 06/16/2023]
Abstract
K2 NiF4 -type Ba-Li oxyhydride (BLHO) transitions to a so-called hydride superionic conductor, exhibiting a high and essentially temperature-independent hydride ion (H- ) conductivity over 0.01 S cm-1 through the disordering of H- vacancies above 300 °C. In this study, a Ba-Li-Na-H-O oxyhydride system synthesized in which lithium is partially substituted with sodium in BLHO and investigated the effects of Na content on the phase transition behavior and the conductivity. Structural refinements and differential scanning calorimetry experiments confirmed a lowering trend in the phase transition temperatures and decreasing enthalpy changes for the transition with increasing Na content. Substitution of not <40% of Li with Na lowered the degree of ordered vacancies at the H- sites at room temperature and improved conductivities by more than two orders of magnitude in the low-temperature region (T < 300 °C) before the phase transition. These findings clearly show that introducing Na into the lattice effectively stabilizes the high-conductive phase of BLHO.
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Affiliation(s)
- Kei Okamoto
- Solid State Chemistry LaboratoryCluster for Pioneering Research (CPR)RIKENWako351–0198Japan
- Department of Structural Molecular ScienceSchool of Physical SciencesSOKENDAI (The Graduate University for Advanced Studies)Okazaki444–8585Japan
- Department of Materials Molecular ScienceInstitute for Molecular ScienceOkazaki444–8585Japan
| | - Fumitaka Takeiri
- Solid State Chemistry LaboratoryCluster for Pioneering Research (CPR)RIKENWako351–0198Japan
- Department of Structural Molecular ScienceSchool of Physical SciencesSOKENDAI (The Graduate University for Advanced Studies)Okazaki444–8585Japan
- Department of Materials Molecular ScienceInstitute for Molecular ScienceOkazaki444–8585Japan
- Japan Science and Technology Agency (JST)Precursory Research for Embryonic Science and Technology (PRESTO)4‐1‐8 HonchoKawaguchiSaitama332‐0012Japan
| | - Yumiko Imai
- Department of Materials Molecular ScienceInstitute for Molecular ScienceOkazaki444–8585Japan
| | - Masao Yonemura
- Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)Ibaraki305–0801Japan
- Department of Materials Structure ScienceSchool of High Energy Accelerator ScienceSOKENDAI (The Graduate University for Advanced Studies)Ibaraki305–0801Japan
| | - Takashi Saito
- Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)Ibaraki305–0801Japan
- Department of Materials Structure ScienceSchool of High Energy Accelerator ScienceSOKENDAI (The Graduate University for Advanced Studies)Ibaraki305–0801Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)Ibaraki305–0801Japan
- Department of Materials Structure ScienceSchool of High Energy Accelerator ScienceSOKENDAI (The Graduate University for Advanced Studies)Ibaraki305–0801Japan
| | - Toshiya Otomo
- Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)Ibaraki305–0801Japan
- Department of Materials Structure ScienceSchool of High Energy Accelerator ScienceSOKENDAI (The Graduate University for Advanced Studies)Ibaraki305–0801Japan
| | - Takashi Kamiyama
- Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)Ibaraki305–0801Japan
- Department of Materials Structure ScienceSchool of High Energy Accelerator ScienceSOKENDAI (The Graduate University for Advanced Studies)Ibaraki305–0801Japan
| | - Genki Kobayashi
- Solid State Chemistry LaboratoryCluster for Pioneering Research (CPR)RIKENWako351–0198Japan
- Department of Structural Molecular ScienceSchool of Physical SciencesSOKENDAI (The Graduate University for Advanced Studies)Okazaki444–8585Japan
- Department of Materials Molecular ScienceInstitute for Molecular ScienceOkazaki444–8585Japan
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7
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Bai Q, Duan Y, Lian J, Wang X. Computation-accelerated discovery of the K2NiF4-type oxyhydrides combing density functional theory and machine learning approach. Front Chem 2022; 10:964953. [PMID: 36092671 PMCID: PMC9458981 DOI: 10.3389/fchem.2022.964953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 07/29/2022] [Indexed: 11/13/2022] Open
Abstract
The emerging K2NiF4-type oxyhydrides with unique hydride ions (H−) and O2- coexisting in the anion sublattice offer superior functionalities for numerous applications. However, the exploration and innovations of the oxyhydrides are challenged by their rarity as a limited number of compounds reported in experiments, owing to the stringent laboratory conditions. Herein, we employed a suite of computations involving ab initio methods, informatics and machine learning to investigate the stability relationship of the K2NiF4-type oxyhydrides. The comprehensive stability map of the oxyhydrides chemical space was constructed to identify 76 new compounds with good thermodynamic stabilities using the high-throughput computations. Based on the established database, we reveal geometric constraints and electronegativities of cationic elements as significant factors governing the oxyhydrides stabilities via informatics tools. Besides fixed stoichiometry compounds, mixed-cation oxyhydrides can provide promising properties due to the enhancement of compositional tunability. However, the exploration of the mixed compounds is hindered by their huge quantity and the rarity of stable oxyhydrides. Therefore, we propose a two-step machine learning workflow consisting of a simple transfer learning to discover 114 formable oxyhydrides from thousands of unknown mixed compositions. The predicted high H− conductivities of the representative oxyhydrides indicate their suitability as energy conversion materials. Our study provides an insight into the oxyhydrides chemistry which is applicable to other mixed-anion systems, and demonstrates an efficient computational paradigm for other materials design applications, which are challenged by the unavailable and highly unbalanced materials database.
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Affiliation(s)
- Qiang Bai
- *Correspondence: Qiang Bai, ; Xiaomin Wang,
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Kasamatsu S, Motoyama Y, Yoshimi K, Matsumoto U, Kuwabara A, Ogawa T. Facilitating ab initio configurational sampling of multicomponent solids using an on-lattice neural network model and active learning. J Chem Phys 2022; 157:104114. [DOI: 10.1063/5.0096645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We propose a scheme for ab initio configurational sampling in multicomponent crystalline solids using Behler-Parinello type neural network potentials (NNPs) in an unconventional way: the NNPs are trained to predict the energies of relaxed structures from the perfect lattice with configurational disorder instead of the usual way of training to predict energies as functions of continuous atom coordinates. An active learning scheme is employed to obtain a training set containing configurations of thermodynamic relevance. This enables bypassing of the structural relaxation procedure which is necessary when applying conventional NNP approaches to the lattice configuration problem. The idea is demonstrated on the calculation of the temperature dependence of the degree of A/B site inversion in three spinel oxides, MgAl2O4, ZnAl2O4, and MgGa2O4. The present scheme may serve as an alternative to cluster expansion for `difficult' systems, e.g., complex bulk or interface systems with many components and sublattices that are relevant to many technological applications today.
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Affiliation(s)
| | - Yuichi Motoyama
- The University of Tokyo Institute for Solid State Physics, Japan
| | - Kazuyoshi Yoshimi
- The University of Tokyo Institute for Solid State Physics Neutron Science Laboratory, Japan
| | | | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Japan
| | - Takafumi Ogawa
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Japan
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9
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Yu Y, Zhang W, Cao H, He T, Chen P. Ion migration in hydride materials. TRENDS IN CHEMISTRY 2022. [DOI: 10.1016/j.trechm.2022.07.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Uncovering the hydride ion diffusion pathway in barium hydride via neutron spectroscopy. Sci Rep 2022; 12:6194. [PMID: 35418572 PMCID: PMC9007959 DOI: 10.1038/s41598-022-10199-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 03/02/2022] [Indexed: 11/20/2022] Open
Abstract
Solid state materials possessing the ability for fast ionic diffusion of hydrogen have immense appeal for a wide range of energy-related applications. Ionic hydrogen transport research is dominated by proton conductors, but recently a few examples of hydride ion conductors have been observed as well. Barium hydride, BaH2, undergoes a structural phase transition around 775 K that leads to an order of magnitude increase in the ionic conductivity. This material provides a prototypical system to understand hydride ion diffusion and how the altered structure produced by the phase transition can have an enormous impact on the diffusion. We employ quasielastic and inelastic neutron scattering to probe the atomic scale diffusion mechanism and vibrational dynamics of hydride ions in both the low- and high-temperature phases. Jump lengths, residence times, diffusion coefficients, and activation energies are extracted and compared to the crystal structure to uncover the diffusion pathways. We find that the hydrogen jump distances, residence times, and energy barriers become reduced following the phase transition, allowing for the efficient conduction of hydride ions through a series of hydrogen jumps of length L = 3.1 Å.
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