Formation of RExNiy (RE = La, Ce, Pr or ND) compounds by calciothermic reduction of La2O3, CeO2, Pr6O11 and Nd2O3

M. Ohtsuka, D. Y. Kim, K. Itagaki

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

LaNi5, CeNi5, PrNi5 and NdNi5 powders were prepared from the coorresponding oxides by a reduction-diffusion method using calcium as reductant and the morphology of the product and the mechanism of the reaction were examined. It was clarified that CaxNiy compounds formed during the reaciton had a significant role in the formation of RExNiy. Instead of a common direct reaction of xRE + yNi = RExNiy, an indirect substitution reaction of aCaxNiy + bRE =cRExNiy + dCa prevailed. This enhanced the rate of formation of RENi5 significantly.

Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalJournal of Alloys and Compounds
Volume230
Issue number1
DOIs
Publication statusPublished - 1995 Nov 15

Keywords

  • Calciothermic reduction
  • Rare earth-nickel compounds
  • Reaction mechanism
  • Reduction-diffusion method

ASJC Scopus subject areas

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

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