A new ternary magnesium-titanium hydride Mg7TiHx with hydrogen desorption properties better than both binary magnesium and titanium hydrides

Daisuke Kyoi, Toyoto Sato, Ewa Rönnebro, Naoyuki Kitamura, Atsushi Ueda, Mikio Ito, Shigeru Katsuyama, Shigeta Hara, Dag Noréus, Tetsuo Sakai

研究成果: Article査読

124 被引用数 (Scopus)

抄録

A magnesium based titanium doped hydride was prepared in a high-pressure anvil cell by reacting a mixture of MgH2 and TiH1.9 at 8GPa and 873K. The metal structure has a Ca7Ge type structure (a = 9.532(2)Å, space group Fm3̄m (no. 225), Z = 4, V = 866.06Å3). The refined metal atom composition Mg7Ti was almost in line with EDS analysis. This means that the new magnesium-titanium hydride has a structure that is more related to TiH1.9 than to MgH2. The thermal properties of the new compound were also studied by TPD analysis. The new hydride, Mg7TiHx exhibits 5.5mass% (x ≈ 12.7) and decomposes into Mg and TiH1.9 upon releasing 4.7mass% of hydrogen around 605K, that is at a 130 and 220K lower desorption temperature compared to MgH2 and TiH1.9, respectively.

本文言語English
ページ(範囲)213-217
ページ数5
ジャーナルJournal of Alloys and Compounds
372
1-2
DOI
出版ステータスPublished - 2004 6 9
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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