Abstract
The effects of reduction and Ga-doping on the physicochemical properties of A-site deficient perovskites Sr 0.9Ti 0.8− x Ga x Nb 0.2O 3 ( x = 0, 0.05, 0.1, 0.15 and 0.2) are reported. With 10% Ga doping, the sample sintered in air and treated at 1400 °C in H 2 atmosphere exhibits the highest electrical conductivity. It is found that the Ga-doping lowers the sinterability but promotes the reduction of Sr 0.9Ti 0.8− x Ga x Nb 0.2O 3. The XRD analysis on the reduced samples suggests that some cations are reduced during the treatment. However, without high temperature pre-reduction, the improvement of Ga-doping is limited and the overall cell performance using Sr 0.9Ti 0.8− x Ga x Nb 0.2O 3 as an anode without catalysts is still relatively low.
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