Journal
MATERIALS RESEARCH BULLETIN
Volume 46, Issue 1, Pages 57-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2010.09.044
Keywords
Ceramics; Electrochemical measurements; X-ray diffraction; Electrochemical properties
Categories
Funding
- Heterogeneous Functional Materials for Energy Systems
- DoE Office of Basic Energy Sciences [DE-SC0001061]
- USC
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The effects of reduction and Ga-doping on the physicochemical properties of A-site deficient perovskites Sr0.9Ti0.8-xGaxNb0.2O3 (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 degrees 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 Sr0.9Ti0.8-xGaxNb0.2O3. 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 Sr0.9Ti0.8-xGaxNb0.2O3 as an anode without catalysts is still relatively low. (C) 2010 Elsevier Ltd. All rights reserved.
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