TY - JOUR
T1 - Structure, conductivity and redox stability of solid solution Ce 1-x Ca x VO4 (0 ≤ x ≤0.4125)
AU - Petit, C. T G
AU - Lan, Rong
AU - Cowin, Peter I.
AU - Kraft, Arno
AU - Tao, Shanwen
PY - 2011/1
Y1 - 2011/1
N2 - A-site-substituted cerium orthovanadates, Ce1-x Ca x VO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-x Ca x VO4 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 I41/amd with a = 7.4004 (1) and c = 6.4983 (6) Å for CeVO4. 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% H2/Ar with conductivity values at 600 °C ranging from 0.3 to 20 mS cm-1 in air to 3 to 30 mS cm-1 in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1VO4 and Ce0.8Ca0.2VO4 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. © 2010 Springer Science+Business Media, LLC.
AB - A-site-substituted cerium orthovanadates, Ce1-x Ca x VO4, were synthesised by solid-state reactions. At room temperature, the solid solution limit in Ce1-x Ca x VO4 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 I41/amd with a = 7.4004 (1) and c = 6.4983 (6) Å for CeVO4. 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% H2/Ar with conductivity values at 600 °C ranging from 0.3 to 20 mS cm-1 in air to 3 to 30 mS cm-1 in reducing atmosphere. In general, the conductivity of Ca-doped CeVO4 is higher in air but lower in a reducing atmosphere comparing to pure CeVO4. The H2/air electrochemical cell measurement indicates that the conduction of sample Ce0.7Ca0.3VO4 is electronic dominant. Samples Ce0.9Ca0.1VO4 and Ce0.8Ca0.2VO4 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. © 2010 Springer Science+Business Media, LLC.
UR - http://www.scopus.com/inward/record.url?scp=78650736280&partnerID=8YFLogxK
U2 - 10.1007/s10853-010-4812-x
DO - 10.1007/s10853-010-4812-x
M3 - Article
SN - 0022-2461
VL - 46
SP - 316
EP - 326
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 2
ER -