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MnをドープしたBiFeO$$_3$$のXAFS測定

XAFS study on Mn-doped BiFeO$$_3$$

米田 安宏   ; 野口 祐二*; 宮山 勝*; 北中 佑樹*

Yoneda, Yasuhiro; Noguchi, Yuji*; Miyayama, Masaru*; Kitanaka, Yuki*

BiFeO$$_3$$は抗電場が非常に大きいために自発分極が結晶構造から期待されるほど大きくない。しかし、Mnをドープすることによって良好なヒステリシスが得られる。BiFeO$$_3$$のMnドープ効果を調べるために、Bi, Fe, Mnの各吸収端でXAFS測定を行い、価数の見積もりと局所構造解析を行った。Mnの価数や局所構造はアニールによって変化していることから、酸素欠損の重要性を示唆している。

BiFeO$$_3$$ is not so large as intrinsic polarization is expected from a crystal structure since the coercive field is very large. However, good hysteresis is obtained by Mn-doping. In order to investigate the Mn dope effect of BiFeO$$_3$$, XAFS measurement was performed by each absorption edge of Bi, Fe, and Mn, and the estimate and local order structure of the valence were conducted. Since the valence and local structure of Mn are changing with annealing, they have suggested the importance of an oxygen deficiency.

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