BiNiO3における圧力誘発による金属間バレンスの移行
Masaki Azuma1, Sandra Carlsson, Jennifer Rodgers
1Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan. masaki@scl.kyoto-u.ac.jp
Journal of the American Chemical Society
|November 2, 2007
まとめ
ビスマスニケラート (BiNiO3) ペロブスキットは圧力下でのバレンスの状態の変化を経験します. 高圧により,材料は電荷の移転により金属のBi(3+) Ni(3+) O3相に変化する.
科学分野:
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
- クリスタルグラフィーです.
背景:
- ビスムスニッケラート (BiNiO3) は,環境圧でユニークな電荷分布を示しています.
- この材料は,Bi(3+) とBi(5+) のイオンをオーダーした歪んだペロブスキート構造を特徴としています.
研究 の 目的:
- 圧力下でのBiNiO3ペロブスキットのバレンスの状態変化を調査する.
- 高圧によって引き起こされる構造的および電子的移行を理解する.
主な方法:
- 物質の構造を研究するために,粉末中性子 difraktion が採用されました.
- 電子性質を分析するために電子状態の計算を行いました.
主要な成果:
- 高圧実験では,電荷不均衡状態から金属のBi3+) Ni3+) O3相への移行が明らかになった.
- 圧力によるNiからBiの電荷移転が観察されました.
- この研究では,AサイトとBサイトの両方で結合電子不安定性を特定しました.
結論:
- BiNiO3における圧力による電荷移転は,前例のない現象である.
- この移行は,様々な基底状態の可能性のある金属高圧相につながります.
- Ni-チャージの不均衡状態は,特定の条件下で観測可能であると予測されています.
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