Analysis of charge compensation mechanisms in Pr 1-xA xCoO 3δ (A = Ca, Sr) by X-ray absorption near-edge structure

Tsuyoshi Yoshioka, Tomoyuki Yamamoto, Akihiko Kitada

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    Abstract

    The charge compensation mechanisms in polycrystalline Pr 1-xCa xCoO 3δ and Pr 1-x Sr xCoOδ here synthesized by the solid-state reaction method have been investigated by analyzing the Pr-L3 and Co-K X-ray absorption near-edge structure (XANES) with the aid of first-principles calculations. The valence states of Pr ions in these materials were determined to be trivalent (Pr3) and independent of the concentration of alkaline-earth ions observed in the Pr-L 3 XANES profile. The Co-K XANES spectra shifted to the higher-energy side with an increase in alkalineearth concentration and were examined in detail by first-principles calculations. Using calculated XANES results, we successfully determined that the valence state of Co ions is an intermediate value between 3+ and 4+ and increases with an increase in the concentration of alkaline-earth ions in Pr 1-xA xCoO 3δ (A = Ca, Sr) accompanying oxygen vacancy.

    Original languageEnglish
    Article number073201
    JournalJapanese Journal of Applied Physics
    Volume51
    Issue number7 PART 1
    DOIs
    Publication statusPublished - 2012 Jul

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    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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