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

ペロブスカイト型化合物Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$のX線吸収分光

松村 大樹  ; 吉井 賢資 ; 辻 卓也 

Matsumura, Daiju; Yoshii, Kenji; Tsuji, Takuya

The perovskite-type oxides R$$_{1-x}$$A$$_{x}$$CoO$$_{3}$$ (R: rare earths, A: alkaline earths) have been extensively studied owing to a variety of many kinds of possible applications as well as their peculiar physical properties. A recent investigation proposed that Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ is suitable for solid oxide fuel cells on the basis of its high electrical conductivity and excellent cell performance. In this study, we have performed X-ray absorption measurements using synchrotron radiation to reveal details of the electronic and crystallographic structures of this system. We have observed local structures around Co from extended X-ray absorption fine structure spectra. It was found that the Debye-Waller factor increased with increasing x up to $$sim$$0.2-0.3, while it is almost unchanged for x larger than $$sim$$0.2-0.3. This result suggests importance of static distortion on the electrical properties of this system.

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