1H NMR and magnetization measurements of a nanostructured composite material of the Mg2Ni-H system synthesized by reactive mechanical grinding

Shigenobu Hayashi, Bogdan Nowak, Shin Ichi Orimo, Hironobu Fujii

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

1H NMR spectra and magnetization have been measured for a nanostructured Mg2Ni-H system. 1H MAS NMR spectra indicate the presence of four phases; α-Mg2NiHx, β-Mg2NiH4, α-MgHx and β-MgH2. Most of the hydrogens are contained in the disordered β-Mg2NiH4 phase. Magnetization consists of superparamagnetic and paramagnetic ones. The former has its origin in Ni particles formed during the hydrogenation. The latter is greater than the values of crystalline α-Mg2NiHx and β-Mg2NiH4. 1H NMR line width increases with the decrease in temperature linearly, most of which is of dipolar origin. The hydrogen is more mobile in the disordered β-Mg2NiH4 phase than in the crystalline counterpart.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Alloys and Compounds
Volume256
Issue number1-2
DOIs
Publication statusPublished - 1997 Jul 5
Externally publishedYes

Keywords

  • Composite material
  • H solid-state nmr
  • Magnesium nickel hydride
  • Magnetization
  • Reactive mechanical grinding

ASJC Scopus subject areas

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

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