Crystal structure of novel hydrides in a Mg-Ni-H system prepared under an ultra high pressure

H. Takamura, H. Kakuta, Atsunori Kamegawa, M. Okada

Research output: Contribution to journalConference article

33 Citations (Scopus)

Abstract

The crystal structure of novel hydrides in the Mg-Ni-H system has been studied using a powder X-ray diffraction and transmission electron microscopy. A cubic-anvil-type apparatus was utilized to prepare samples. The new hydride with a chemical composition of around MgH 2-60 at% Ni was synthesized at 1073 K for 2 h under a pressure as high as 5 GPa. From TGA analysis, the new hydride was found to be Mg 2Ni 3H 3.4. Orthorhombic and monoclinic crystal systems with a primitive cell were proposed as possible symmetries of the new hydride. X-ray and electron diffraction patterns of the new hydride were indexed in an orthorhombic structure with a□ 0.8859(4), b□ 1.3740(5), c□ 0.4694(2) nm. Moreover, decomposition of the hydride into Mg 2Ni was observed by the transmission electron microscopy.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalJournal of Alloys and Compounds
Volume330-332
DOIs
Publication statusPublished - 2002 Jan 17
EventProceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia
Duration: 2000 Oct 12000 Oct 6

Keywords

  • Crystal structure
  • Hydride
  • Magnesium-nickel-hydrogen system
  • TEM
  • XRD

ASJC Scopus subject areas

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

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