In situ X-ray diffraction study of hydrogen-induced phase decomposition in LaMg12 and La2Mg17

Dalin Sun, Franz Gingl, Yumiko Nakamura, Hirotoshi Enoki, Mohomed Bououdina, Etsuo Akiba

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

In situ X-ray diffraction (XRD) shows that LaMg12 and La2Mg17 are thermally stable under argon upon heating to 330°C, while under hydrogen they decompose to LaH3 and MgH2 at about 290 and 270°C, respectively. The decomposition is believed to result from the large difference in enthalpy between the parent compounds and the resultants. Prior to the decomposition, the lattice parameters of LaMg12 and La2Mg17 do not change, indicating that hydrogen does not dissolve into them to form solid solution of LaMg12Hx and La2Mg17Hx. The enhanced mobility of La and/or Mg was observed in the presence of hydrogen, which might be related to the formation of the copious vacancy.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalJournal of Alloys and Compounds
Volume333
Issue number1-2
DOIs
Publication statusPublished - Feb 14 2002

All Science Journal Classification (ASJC) codes

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

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