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

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

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.

Language	:	English
Journal	:	Journal of the American Chemical Society
Volume	:	131
Number	:	44
Pages	:	p.16244 - 16247
Publication Year/Month	:	2009/10
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Paper URL	:	https://doi.org/10.1021/ja906668c
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20090619
JAEA Abstracts No. : 38000060
Paper Submission No. : 6644

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