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

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)213-217
Number of pages5
JournalJournal of Alloys and Compounds
Volume372
Issue number1-2
DOIs
Publication statusPublished - 2004 Jun 9
Externally publishedYes

Keywords

  • High pressure
  • Hydrogen
  • Magnesium
  • Metal hydrides
  • Titanium

ASJC Scopus subject areas

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

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