Stabilization of Face-Centered Cubic High-Pressure Phase of REH<sub>3</sub> (RE = Y, Gd, Dy) at Ambient Pressure by Alkali or Alkaline-Earth Substitution

DOI Web Site 被引用文献6件 参考文献30件
  • Riki Kataoka
    New Energy Carrier Research Group, Research Institute of Electrochemical Energy, National Institute of Advanced Science and Technology, Osaka, Japan
  • Toru Kimura
    Research Center for Environmentally Friendly Materials Engineering, Muroran Institute of Technology, Muroran, Japan
  • Nobuhiko Takeichi
    New Energy Carrier Research Group, Research Institute of Electrochemical Energy, National Institute of Advanced Science and Technology, Osaka, Japan
  • Atsunori Kamegawa
    Research Center for Environmentally Friendly Materials Engineering, Muroran Institute of Technology, Muroran, Japan

書誌事項

公開日
2018-04-05
資源種別
journal article
DOI
  • 10.1021/acs.inorgchem.8b00409
公開者
American Chemical Society (ACS)

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説明

Heavy rare-earth trihydrides such as GdH3, DyH3, and yttrium trihydide (YH3) usually show a hexagonal crystal structure under ambient pressure. This structure is known to transform to a face-centered cubic (FCC) one at higher pressures (at the order of GPa), and the FCC one returns to the hexagonal structure when the applied pressure is released. In this study, we investigated the structure of alkaline or alkaline-earth (A)-substituted REH3 (RE = Y, Gd, Dy; A = Li, K, or Mg) using X-ray diffraction, and measured the phase transition pressure. We found that this FCC high-pressure phase can be stabilized by 10-33 mol % A substitution for RE in the REH3. The mechanism of phase stabilization is simply explained by the ionic radius ratio between the cation and anion ( rcat/ rani), as well as the stabilities of other ionic crystals such as perovskite materials. For all considered REH3 samples, the FCC phase becomes stable when rcat/ rani > 0.856, such as in the case of 10 mol % Li-substituted YH3.

収録刊行物

  • Inorganic Chemistry

    Inorganic Chemistry 57 (8), 4686-4692, 2018-04-05

    American Chemical Society (ACS)

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