A-site substituted cerium metavanadates, Ce(1-x)Ca(x)VO(3), 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 group Pnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) angstrom for Ce(0.8)Ca(0.2)VO(3). X-Ray diffraction patterns and thermal analyses have shown that the reduction of Ca-doped CeVO(3) 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 H(2)-Ar with conductivity of Ce(1-x)Ca(x)VO(3) ranging from 1.5 to 13 S cm(-1) at 700 degrees C in a reducing atmosphere. Sample Ce(0.7)Ca(0.3)VO(3) 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 Ce(0.7)Ca(0.3)VO(3) is higher than that for Ce(0.85)Sr(0.15)VO(3) which could be related to the higher doping level.
Petit, C. TG., Lan, R., Cowin, P. I., Irvine, J. T. S., & 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