Novel Hydrides in Li-TM Systems Synthesized by High Pressure Method (TM=Ti, Zr, Hf)

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  • Kataoka Riki
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Sato Toyoto
    WPI Advanced Institute for Materials Research, Tohoku University
  • Kuriiwa Takahiro
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Kamegawa Atsunori
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Okada Masuo
    Department of Materials Science, Graduate School of Engineering, Tohoku University

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New Li-based hydrides have been prepared under GPa-order by using a cubic-anvil-type apparatus. Novel compounds in Li-Zr and Li-Hf systems were obtained at 973 K under 5 GPa. For Li-Zr system, a novel compound has a primitive cubic structure with a=0.42188(3) nm. The compound was thermally stable up to 723 K under Ar flow. For Li-Hf system, two novel compounds were successfully synthesized. Crystal structures of these compounds were found to be a primitive cubic (a=0.4209(2) nm) and a body centered cubic (a=1.08369(4) nm). A structural model of the new compounds with the body-centered cubic structure was found to be an Ag8Ca3-type structure. The novel compound with a primitive cubic structure was thermally stable up to 723 K, but the compound with the body centered cubic structure was decomposed at 600 K with an endothermic reaction.

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