Formation of SrVO3 precursors from Sr(OH)2 and VmOn (2/5 ≦m/ n≦ 2/3) by mechanical stressing under ambient or reducing atmosphere

Wha Sup Lee, Tetsuhiko Isobe, Mamoru Senna

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Mechanochemical and subsequent heating processes to produce SrVO3 are studied, starting from a mixture of Sr(OH)2 and VmOn (2/5 ≦ m/n ≦2/3) by milling and heating in an ambient or reducing atmosphere. Single phase perovskite SrVO3 was obtained by firing the milled mixtures at 1300°C under reducing atmosphere with four dehydration steps via two intermediates, Sr2V2O7 and Sr8V8O25. The fourth dehydration step, corresponding to transformation of Sr8V8O25 to SrVO3, appears at around 1100°C by heating mixtures containing trivalent vanadium and milled in a reducing atmosphere. Dehydration of the mixtures was promoted by milling under N2-4% H2, due to reduction of precursors by hydrogen. The precursor from the mixture with III-V mixed-valent vanadium milled under N2-4% H2 is closer to the final product SrVO3 than any other precursors.

Original languageEnglish
Pages (from-to)293-300
Number of pages8
JournalSolid State Ionics
Volume123
Issue number1-4
Publication statusPublished - 1999 Dec 1

Keywords

  • Mechanochemical process
  • Mixed-valency of vanadium
  • Perovskite
  • Precursor of SrVO

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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