Nonstoichiometric composition and densification of CaRuO3 by SPS

Nittaya Keawprak, Rong Tu, Takashi Goto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Calcium ruthenates were prepared in different ratios of Ru to Ca (R Ru/Ca = 0.5 - 1.4) by spark plasma sintering. CaRuO3 in a single phase was obtained at RRu/Ca = 1.0. At RRu/Ca < 1.0, a mixture of CaRuO3 and CaO was obtained, whereas CaRuO 3 with second phase of RuO2 was obtained at R Ru/Ca > 1.0. The density at RRu/Ca < 1.0 were 80-85% and slightly increased with increasing RRu/Ca. The density significantly increased up to 95% with increasing RRu/Ca from 1.1 to 1.4, suggesting that the second phase of RuO2 was effective to densify CaRuO3. The density of CaRuO3 in a single phase was 82% at most. The lattice parameters of CaRuO3 decreased with increasing RRu/Ca from 0.7 to 1.0, showing a nonstoichiometric range of Ca1+δRuO3+δ.

Original languageEnglish
Pages (from-to)251-254
Number of pages4
JournalKey Engineering Materials
Volume352
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • CaRuo
  • Nonstoichiometry
  • Spark plasma sintering

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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