Synthesis of new hydrides with cubic structures in Mg-Ca-Ni systems by using high pressure

Y. Goto, H. Kakuta, A. Kamegawa, H. Takamura, M. Okada

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16 Citations (Scopus)

Abstract

Phases and thermal stability of new hydrides synthesized by using under a high pressure of 5 GPa in Ca-Mg-Ni-H systems were studied. The high-pressure synthesis was carried out at 1073 K-1223 K for 2h under 5 GPa by using an anvil-type apparatus. A series of (Ca1-xMgx)2NiHδ was found to form solid solution in the range of x = 0-0.4. This hydride decomposed around 646 K regardless of Mg content. In CaH2-X%MgH2 systems, hydrides with BCC structure were obtained in the range of X = 50-67. Lattice constant of the BCC phase decreased from 0.4032(9)nm (X = 50) to 0.3988(3)nm (X = 67) with increasing Mg content. The decomposed temperature of the BCC phase increased from 650 K (X = 50) to 673 K (X = 67) with increasing Mg content, in other words, with decreasing the lattice constant of BCC phase.

Original languageEnglish
Pages (from-to)1850-1853
Number of pages4
JournalMaterials Transactions
Volume42
Issue number9
DOIs
Publication statusPublished - 2001

Keywords

  • High pressure
  • Hydride
  • Magnesium-calcium
  • Magnisium-calcium-nickel

ASJC Scopus subject areas

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

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