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- Title
Structure, conductivity and redox stability of solid solution CeCaVO (0 ≤ x ≤ 0.4125).
- Authors
Petit, Christophe T. G.; Lan, Rong; Cowin, Peter I.; Kraft, Arno; Tao, Shanwen
- Abstract
-site-substituted cerium orthovanadates, CeCaVO, were synthesised by solid-state reactions. At room temperature, the solid solution limit in CeCaVO series is at x = 0.4125. The crystal structure was analysed by X-ray diffraction and it exhibits a tetragonal zircon structure of space group I4/ amd with a = 7.4004 (1) and c = 6.4983 (6) Å for CeVO. The UV-Visible absorption spectra indicated that the compounds have band gaps at room temperature in the range of 4.2-4.5 eV. Conductivity measurements were performed for the first time up to the calcium solid solution limit in both air and dry 5% H/Ar with conductivity values at 600 °C ranging from 0.3 to 20 mS cm in air to 3 to 30 mS cm in reducing atmosphere. In general, the conductivity of Ca-doped CeVO is higher in air but lower in a reducing atmosphere comparing to pure CeVO. The H/air electrochemical cell measurement indicates that the conduction of sample CeCaVO is electronic dominant. Samples CeCaVO and CeCaVO are 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.
- Subjects
OXIDATION-reduction reaction; CERIUM; SOLID state chemistry; X-ray diffraction; ZIRCON; ABSORPTION spectra
- Publication
Journal of Materials Science, 2011, Vol 46, Issue 2, p316
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-010-4812-x