A novel magnesium-vanadium hydride synthesized by a gigapascal-high- pressure technique

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

研究成果: Article査読

67 被引用数 (Scopus)

抄録

A magnesium-based vanadium-doped hydride was prepared in a high-pressure anvil cell by reacting a MgH2-25%V molar mixture at 8GPa and 873K. The new magnesium-vanadium hydride has a cubic F-centred substructure (a=4.721(1)Å), with an additional superstructure, which could be described by a doubling of the cubic cell axis and a magnesium atom framework, including an ordered arrangement of both vanadium atoms and vacancies (a=9.437(3)Å, space group Fm3m (no. 225), Z=4, V=840.55Å3). The metal atom structure is related to the Ca7Ge type structure but the refined metal atom composition with vacancies on one of the magnesium sites corresponding to Mg6V nearly in line with EDX analysis. The thermal properties of the new compound were also studied by TPD analysis and TG-DTA. The onset of the hydrogen desorption for the new Mg6V hydride occurred at a 160K lower temperature when compared to magnesium hydride at a heating rate of 10K/min.

本文言語English
ページ(範囲)253-258
ページ数6
ジャーナルJournal of Alloys and Compounds
375
1-2
DOI
出版ステータスPublished - 2004 7月 28
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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