High pressure synthesis of novel metal hydrides

Daisuke Kyoi, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada, Naoyuki Kitamura, Tetsuo Sakai

Research output: Contribution to journalArticlepeer-review


Among metal hydrides, magnesium hydride (MgH2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity 7.6 mass%. However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg7TiH 16 6.9 mass% would release hydrogen at a lower temperature by 130 K than MgH2. The Mg-H ionic bonding distance in Mg7TiH 16 is longer than that in MgH2. The observed lower dehydrogenation temperature seems to be consistent with the structure.

Original languageEnglish
Pages (from-to)264-270
Number of pages7
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Issue number3
Publication statusPublished - 2007


  • High pressure synthesis
  • Hydrogen storage materials
  • Magnesium-based hydrides


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