A-site substituted cerium metavanadates, Ce1−xCaxVO3,were synthesised by solid-state reactions from single-phase powders of the corresponding orthovanadates. All metavanadate samples were found to exhibit either an orthorhombic and/or monoclinic phase of space groupPnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) Å for Ce0.8Ca0.2VO3. X-Ray diffraction patterns and thermal analyses have shown that the reduction of Ca-doped CeVO3 from the equivalent orthovanadate is redox phase reversible without formation of parasitic phases at x = 0.2, 0.3. Conductivity measurements were performed in air and in dry 5% H2–Ar with conductivity of Ce1−xCaxVO3 ranging from 1.5 to 13 S cm−1 at 700 °C in a reducing atmosphere. Sample Ce0.7Ca0.3VO3 exhibits the highest conductivity in a reducing atmosphere in all the measured samples which could be a potential anode or as a part of composite anode for SOFCs. The conductivity of Ce0.7Ca0.3VO3 is higher than that for Ce0.85Sr0.15VO3 which could be related to the higher doping level.
Petit, C. TG., Lan, R., Cowin, P. I., Irvine, J. TS., & Tao, S. (2011). Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate. Journal of Materials Chemistry, 21(24), 8854-8861. https://doi.org/10.1039/C1JM10960J