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

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalJournal of Alloys and Compounds
Volume375
Issue number1-2
DOIs
Publication statusPublished - 2004 Jul 28
Externally publishedYes

Keywords

  • High pressure
  • Hydrogen
  • Magnesium
  • Metal hydrides
  • Vanadium

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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