The multiphase effect on crystal structure, hydrogen absorbing properties and electrode performance of ScZr based Laves phase alloys

M. Yoshida, H. Ishibashi, K. Susa, T. Ogura, E. Akiba

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7 Citations (Scopus)

Abstract

The crystal structure, hydrogen absorbing properties and electrode performance of Laves phase alloy systems, ScZrNiMn and ScNiV systems, were studied by optical and scanning electron microscopy, X-ray powder diffraction, pressure-composition isotherm and electrochemical measurements. C14 and C15 Laves phases and minor ScNi-related phase were found in the ScZrNiMn alloy system. The ScNi-related phase was composed of Sc, Zr and Ni elements. Two kinds of minor phase, BCC and ScNi-related phases, were identified in addition to the C15 phase in the ScZrNiV alloy system. The BCC contained mainly the element V. The ScNi-related phase contributed to an increase in the hydrogen capacity, but those in the V alloy system did not. The multiphase anode with a large amount of the ScNi-related phase showed a low durability against the KOH electrolyte. The substitution of Zr by Sc led to an improvement in the initial activation of the anode, but there was not a clear correlation between the presence of the multiphase in the anode and the rate capability.

Original languageEnglish
Pages (from-to)100-108
Number of pages9
JournalJournal of Alloys and Compounds
Volume230
Issue number2
DOIs
Publication statusPublished - Dec 1 1995

All Science Journal Classification (ASJC) codes

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

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