Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore

Masao Kita, Takahisa Omata, Shinya Otsuka-Yao-Matsuo, Motomi Katada

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Pyrochlore-type oxide, SnII1.64(Ta 1.88SnIV0.12)O6.58 was oxidized for exploring novel metastable phases. Two novel SnIV 0.82(Ta0.94SnIV0.06)O 4.11 phases with a fluorite-related structure, which was obtained as a pure phase, and with a rutile-related structure appearing as an impurity for the fluorite-related phase were successfully obtained similar to the previous Sn-Nb-O system. The ordered arrangement of respective cations of Sn and (0.94Ta+0.06Sn) in the precursor SnII1.64(Ta 1.88SnIV0.12)O6.58 was left in the both oxidized SnIV0.82(Ta0.94Sn IV0.06)O4.11 phases. In contrast to the previous Sn-Nb-O system, the cation-ordered α-PbO2-related SnIV0.82(Ta0.94SnIV 0.06)O4.11 could not be obtained in the present conditions. Such a difference between the Sn-Ta-O and Sn-Nb-O systems was interpreted by larger energy barrier of the transformation from the fluorite-related phase to α-PbO2-related phase in Sn-Ta-O system than in Sn-Nb-O system.

Original languageEnglish
Pages (from-to)1254-1261
Number of pages8
JournalJournal of Solid State Chemistry
Volume178
Issue number4
DOIs
Publication statusPublished - 2005 Apr

Keywords

  • Cation-ordered structure
  • Fluorite structure
  • Metastable phase
  • Oxygen intercalation
  • Phase transformation
  • Pyrochlore structure
  • Tantalum oxide
  • Tin oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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