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Pressure-Induced Spin-State Transition in BiCoO3
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2010-07-14 , DOI: 10.1021/ja102987d Kengo Oka 1 , Masaki Azuma 1 , Wei-tin Chen 1 , Hitoshi Yusa 1 , Alexei A. Belik 1 , Eiji Takayama-Muromachi 1 , Masaichiro Mizumaki 1 , Naoki Ishimatsu 1 , Nozomu Hiraoka 1 , Masahiko Tsujimoto 1 , Matthew G. Tucker 1 , J. Paul Attfield 1 , Yuichi Shimakawa 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2010-07-14 , DOI: 10.1021/ja102987d Kengo Oka 1 , Masaki Azuma 1 , Wei-tin Chen 1 , Hitoshi Yusa 1 , Alexei A. Belik 1 , Eiji Takayama-Muromachi 1 , Masaichiro Mizumaki 1 , Naoki Ishimatsu 1 , Nozomu Hiraoka 1 , Masahiko Tsujimoto 1 , Matthew G. Tucker 1 , J. Paul Attfield 1 , Yuichi Shimakawa 1
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The structural and electronic properties of BiCoO(3) under high pressure have been investigated. Synchrotron X-ray and neutron powder diffraction studies show that the structure changes from a polar PbTiO(3) type to a centrosymmetric GdFeO(3) type above 3 GPa with a large volume decrease of 13% at room temperature revealing a spin-state change. The first-order transition is accompanied by a drop of electrical resistivity. Structural results show that Co(3+) is present in the low spin state at high pressures, but X-ray emission spectra suggest that the intermediate spin state is present. The pressure-temperature phase diagram of BiCoO(3) has been constructed enabling the transition temperature at ambient pressure to be estimated as 800-900 K.
中文翻译：
BiCoO3 中压力诱导的自旋态转变
研究了高压下 BiCoO(3) 的结构和电子特性。同步加速器 X 射线和中子粉末衍射研究表明，结构从极性 PbTiO(3) 型转变为高于 3 GPa 的中心对称 GdFeO(3) 型，室温下体积大幅减少 13%，表明自旋态发生变化. 一阶跃迁伴随着电阻率的下降。结构结果表明 Co(3+) 在高压下处于低自旋状态，但 X 射线发射光谱表明存在中间自旋状态。已经构建了 BiCoO(3) 的压力-温度相图，使环境压力下的转变温度估计为 800-900 K。
更新日期：2010-07-14
中文翻译：
BiCoO3 中压力诱导的自旋态转变
研究了高压下 BiCoO(3) 的结构和电子特性。同步加速器 X 射线和中子粉末衍射研究表明，结构从极性 PbTiO(3) 型转变为高于 3 GPa 的中心对称 GdFeO(3) 型，室温下体积大幅减少 13%，表明自旋态发生变化. 一阶跃迁伴随着电阻率的下降。结构结果表明 Co(3+) 在高压下处于低自旋状态，但 X 射线发射光谱表明存在中间自旋状态。已经构建了 BiCoO(3) 的压力-温度相图，使环境压力下的转变温度估计为 800-900 K。
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