Defect structure of Ta- and Al- doped Zn2TiO4 showing oxide ion conduction via cation vacancy

Shigeomi Takai, Hirotaka Okada, Kenji Ohoyama, Takao Esaka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

To investigate the defect structure of Zn2-x/2Ti 1-xTaxO4 and the subsequent oxide ion conduction, equimolar Al3+ with Ta5+ have been partly substituted instead of Ti4+ ions in Zn2TiO4, forming Zn2Ti1-2xTaxAlxO4 with no significant cation vacancy despite of tantalum substation. Inverse spinel-type structured solid solution was approximately formed up to x = 0.3 and the measured powder density agreed with the nominal model where all the cation sites ware almost occupied. A slight decrease in oxide ion conductivity was observed for Zn2Ti1-2xTax:AlxO 4 with the dual substitution by x, while apparent increase for Zn2-x/2Ti1-xTaxO4, indicating that the cation vacancy is responsible for the oxide ion conduction in Zn 2TiO4-based system. Powder neutron diffraction revealed the defect structure, which were then discussed in terms of the oxide ion conduction mechanism with the deduced isotropic temperature factors of oxide ions.

Original languageEnglish
Pages (from-to)525-529
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume116
Issue number1352
DOIs
Publication statusPublished - 2008 Apr

Keywords

  • Cation deficiency
  • Defect structure
  • Ionic conductor
  • Neutron diffraction
  • Zinc titanium oxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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