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X-ray absorption study of perovskite cobaltite Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$

Yoshii, Kenji  ; Matsumura, Daiju   

Perovskite cobalt oxides have been extensively studied from several viewpoints such as a possible application to solid oxide fueld cells (SOFCs). Recently, Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ was proposed to be suitable to SOFCs, on the basis of its high electrical conductivity. In particular, the oxide with x=0.3 has the hightst conductivity, which may be due to the change of electronic structure arising from an increase in oxygen vacancy for x$$>$$0.3. In this study, we have measured X-ray absortpion spectra at Pr and Co absorption edges to obtain the information on electronic and local-crystal structures of this system. It was found that the Debye-Waller factor is saturated at around x=0.3 from the measurement at Co K-edge, suggesting a correlation between the atomic vibration and the electrical conductivity. Other data such as the change of valence state against x will be discussed also.

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