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X-ray absorption spectroscopy and magnetocaloric study of Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5)

Matsumura, Daiju   ; Tsuji, Takuya  ; Yoshii, Kenji  

We have conducted X-ray absorption spectroscopy study for perovskite cobaltite Pr$$_{1-x}$$Sr$$_{x}$$CoO$$_{3}$$ (0$$leq x leq$$0.5) to understand Sr doping effect and magnetocaloric measurement for Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ to reveal the origin of magnetic anomaly at around 110 K. The extended X-ray absorption fine structure (EXAFS) measurements at the Co ${it K}$-edge suggest that the average valence value of Co ions increases, the interatomic distance of Co-O bonding decreases, and the local distortion of CoO$$_{6}$$ octahedron increases as Sr is doped in PrCoO$$_{3}$$. The interatomic distance of Co-O bonding shrinks more greatly for the larger doping region. No temperature dependent electronic and structural changes were observed from Co ${it K}$-edge X-ray absorption spectra in the whole thermal range studied (17-300 K). The magnetocaloric effect of Pr$$_{0.5}$$Sr$$_{0.5}$$CoO$$_{3}$$ indicates the change of magnetic structure at 110 K.

Language

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English

Journal

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Materials Chemistry and Physics

Volume

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238

Number

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Pages

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p.121885_1 - 121885_5

Publication Year/Month

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2019/12

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Held date

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1016/j.matchemphys.2019.121885

DOI for research data

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Keywords

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コバルト酸化物; X線吸収分光; 磁気熱量効果

Research Facility

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SPring-8(大型放射光施設)

Press Release

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Article of JAEA R&D Review

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- Accesses

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Percentile:0

Category:Materials Science, Multidisciplinary

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