The electrical and defect properties of Bi3Zn2Sb3O14 pyrochlore: A grain-boundary phase in ZnO-based varistors

Jane Clayton, Hitoshi Takamura, Renaud Metz, Harry L. Tuller, Bernhardt J. Wuensch

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The electrical conductivity of Bi3Zn2Sb3O14 pyrochlore was studied as a function of temperature and partial pressure of oxygen. Conductivity measurements by ac complex impedance analysis and ionic transference number measurements show this pyrochlore to be a mixed ionic-electronic conductor with an energy band gap of 3.15 ± 0.9 eV. A defect model in which Frenkel defects on the oxygen lattice are dominant is confirmed. Enthalpies of reduction, oxidation and the sum of oxygen vacancy formation and migration were found to be 4.82 ± 0.8 eV, 1.48 ± 1.0 eV and 1.67 ± 1.0 eV respectively.

Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalJournal of Electroceramics
Volume7
Issue number2
DOIs
Publication statusPublished - 2001 Nov

Keywords

  • Electrical conductivity
  • Grain boundary barriers
  • Ionic transference number
  • Mixed conductor
  • Varistor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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