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.
|Number of pages||8|
|Journal||Journal of Solid State Chemistry|
|Publication status||Published - Jun 2010|
- Ce 1-x Sr x VO 4
- Cerium orthovanadates
- Solid solution