High Oxide Ion Conductivity in Non-Stoichiometric Pyrochlores and Fluorites in the Ternary System ZrO2-Gd2O3-TiO2

A. J. Feighery*, J. T. S. Irvine, C. Zheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The extents of the cubic fluorite and pyrochlore regions in the ternary oxide system ZrO2-Gd2O3-TiO2 have been determined experimentally. AC impedance measurements of single phase fluorite and pyrochlore compositions show high oxide ion conduction in compositions containing 20 mol% TiO2. Resolution of the bulk and grain boundary contributions to the total conductivity show that the bulk ionic conductivity increases with Gd2O3 content up to the stoichiometric composition containing 33.33 mol% Gd2O3 and then decreases upon further addition of the aliovalent dopant. Trends in conductivity as a function of temperature and dopant density are discussed.

Original languageEnglish
Pages (from-to)30-35
Number of pages6
JournalIonics
Volume3
Issue number1-2
Publication statusPublished - Jan 1997

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