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Various valence states of square-coordinated Mn in A-site-ordered perovskites

Aサイトペロブスカイト型平面四配位Mnの価数

Long, Y.*; 斎藤 高志*; 水牧 仁一朗*; 安居院 あかね; 島川 祐一*

Long, Y.*; Saito, Takashi*; Mizumaki, Masaichiro*; Agui, Akane; Shimakawa, Yuichi*

近年、Aサイト秩序型ペロブスカイト酸化物AA'3B412で興味深い物性が数多く発見されている。これらは半導体的であり、反強磁性的な振る舞いを示す。AサイトにMnが入ったLaMn$$_{3}$$Cy$$_{4}$$O$$_{12}$$, LaMn$$_{3}$$Ti$$_{4}$$O$$_{12}$$が平面四配位構造を持ちながらMnの価数が+3から+1.67をとることがわかったので報告する。

A-site-ordered perovskites LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ and LaMn$$_{3}$$Ti$$_{4}$$O$$_{12}$$ were synthesized under high-pressure and high-temperature conditions. The charge formula of LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ was found to be LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ with Mn$$^{3+}$$ at the square-coordinated A site. The valence of the A-site Mn ions in LaMnTi$$_{4}$$O$$_{12}$$ appeared to be less than +2, and the charge combination in this compound seemed to be LaMnTi$$_{4}$$O$$_{12}$$. Although the square-coordinated A site in A-site-ordered perovskites has been widely known to be occupied by Jahn-Teller active Mn$$^{3+}$$, the present results show that the valence of Mn at the A site can vary from +3 to possible +1.67.

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パーセンタイル:79.35

分野:Chemistry, Multidisciplinary

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