High-pressure synthesis of MgNi intermetallic compound and its thermal stability

Yasutaka Kamata, Riki Kataoka, Daisuke Kyoi, Atsunori Kamegawa, Masuo Okada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A novel intermetallic compound of MgNi was synthesized from amorphous MgNi by high pressure technique. Crystal structure, thermal stability and hydrogenation property of the compound were studied. The crystallized MgNi was synthesized at 573 K for 2 h under the pressure of more than 5 GPa, and was found to exhibit a CuTi-type structure with lattice parameters of a = 0.2997(1) nm, c = 0.3166(2) nm. The MgNi was decomposed into Mg2Ni and amorphous phase at 575 K and decomposed into Mg2Ni and MgNi 2 over 682 K. Moreover the MgNi was hydrogenated into novel hydride with a CsCl-type structure at 355 K under 2 MPa hydrogen. This novel hydride with a lattice parameter of a = 0.3215(1)nm was decomposed into Mg2Ni and MgNi2 over 428 K under an Ar atmosphere.

Original languageEnglish
Pages (from-to)457-460
Number of pages4
JournalMaterials Transactions
Volume49
Issue number3
DOIs
Publication statusPublished - 2008 Mar

Keywords

  • High-pressure
  • Hydrogen storage alloy
  • Magnesium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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