Structure and conductivity of strontium-doped cerium orthovanadates Ce1-xSrxVO4 (0≤x≤0.175)

C. T G Petit, Rong Lan, Peter I. Cowin, Shanwen Tao

Research output: Contribution to journalArticle

Abstract

A-site substituted cerium orthovanadates, Ce1-xSrxVO4, were synthesised by solid-state reactions. It was found that the solid solution limit in Ce1-xSrxVO4 is at x=0.175. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I41/amd (1 4 1) with a=7.3670 (3) and c=6.4894 (1) Å for Ce0.825Sr0.175VO4. The UV-vis absorption spectra indicated that the compounds have band gaps at room temperature in the range 4.5-4.6 eV. Conductivity measurements were performed for the first time up to the strontium solid solution limit in air and in dry 5% H2/Ar with conductivity values at 600 °C ranging from 0.3 to 30 mS cm-1 in air to 30-45 mS cm-1 in reduced atmosphere. Sample Ce0.825Sr0.175VO4 is redox stable at a temperature below 600 °C although the conductivity is not high enough to be used as an electrode for solid oxide fuel cells. © 2010 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)1231-1238
Number of pages8
JournalJournal of Solid State Chemistry
Volume183
Issue number6
DOIs
Publication statusPublished - Jun 2010

Keywords

  • Ce 1-x Sr x VO 4
  • Cerium orthovanadates
  • Conductivity
  • Solid solution

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