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異常に高いバレンスの状態であるFe ((4+) の二次元電荷不均衡は,二層の二重ペロブスキートで,層状に二重ペロブスキートである
Yoshiteru Hosaka1, Noriya Ichikawa1, Takashi Saito1
1†Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Journal of the American Chemical Society
|May 29, 2015
まとめ
Ca2FeMnO6における電荷不均衡は,Fe(4+) が200 KでFe(3+) とFe(5+) に分裂することを含む.これには,順番のスピンにより95 Kでユニークなフェリ磁性構造が続く.
科学分野:
- 固体化学 固体化学
- マテリアルサイエンス 材料科学
- クリスタルグラフィーです.
- マグネチズム (磁気) とは
背景:
- Ca2FeMnO6は二重ペロブスキート酸化物の層状である.
- 室温でMn{4+) とFe{4+) イオンの二次元配置を示している.
- 化合物は冷却時に電荷不均衡と磁気移行を経験します.
研究 の 目的:
- 負荷不均衡のCa2FeMnO6.6の結晶と磁気構造を分析する.
- 負荷不均衡のメカニズムとその磁気秩序との関係を理解する.
- この材料で観察されたユニークな磁気構造の性質を明らかにするために.
主な方法:
- ニュートロン粉の difraktion は,結晶と磁気構造を調査するために使用されました.
- 分析は,温度に依存する構造および磁気特性に焦点を当てた.
主要な成果:
- Fe(4+) をFe(3+) とFe(5+) にする電荷の不釣り合いは200Kほどで発生し,チェッカーボードのパターンを形成します.
- 95 Kで,相応の非コリネアフェリ磁気構造への磁気移行が観察される.
- 磁気構造はFe(3+) とFe(5+) のスピンの間の反鉄磁気結合から生じる.
結論:
- この研究は,Ca2FeMnO6の磁気順序を先行するユニークな電荷順序状態を明らかにしています.
- 観測されたフェリ磁気性は,電荷不均衡とスピン相互作用の相互作用に起因する.
- ユニークな磁気構造は,有効なスピンを持つリガンドホールの二次元の局所化に関連しています.
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