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Abstract
Electronic and local structures of the perovskite-type La0.6Sr0.4CoO3-d, which is a promising cathode material for solid oxide fuel cells, were investigated by means of in-situ micro x-ray absorption spectroscopy measurements under working conditions of solid oxide fuel cells, 1073 K of temperature and 10-105 Pa of oxygen partial pressure. It was found that variations of electronic and local structures of La0.6Sr0.4CoO3-d depending on variations of ambient oxygen partial pressure were clearly detected and could be associated with formation/disappearance of oxygen vacancies in the oxide. It was shown that in-situ x-ray absorption spectroscopy measurements could be a useful tool to examine electronic and local structures of high temperature materials in use.
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