High pressure synthesis of novel Mg(Ni1-xCux) 2 hydrides (x = 0-0.2)

Riki Kataoka, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In our previous papers, we have reported the hydrogenation of MgNi 2 with C36-type structure under GPa-order hydrogen pressure. In this paper, the effect of Cu substitution in MgNi2 was studied on the crystal structures, thermal stabilities and hydrogen contents of Mg(Ni 1-xCux)2 hydrides (x = 0-0.2). The hydrides were obtained by high pressure synthesis using cubic-anvil-type apparatus at 973 K for 8 h under 5 GPa. The hydrides were found to have primitive orthorhombic (Pmmm, X = 0.0-0.1) and body-centered tetragonal structures (JA/mmm, X = 0.15-0.2). Their hydrogen contents were estimated to be 2.23-2.32 mass%. Dehydrogenation temperature decreased from 460 K (x = 0.0) to 429 K (x = 0.20) with increasing amount of Cu substitution. After dehydrogenation, the C36-type phase was observed by X-ray diffraction (XRD). Consequently, it is noteworthy that Mg (Ni1-xCux) 2 could be hydrogenated reversibly without disproportionation under high pressure of the order of gigapascals.

Original languageEnglish
Pages (from-to)1179-1182
Number of pages4
JournalMaterials Transactions
Volume50
Issue number5
DOIs
Publication statusPublished - 2009 May

Keywords

  • High pressure synthesis
  • Hydride
  • Hydrogen storage alloys
  • Magnesium
  • Mg(Ni Cu)2
  • MgNi

ASJC Scopus subject areas

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

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