Pressure-Induced Spin-State Transition in BiCoO3

被引：153

作者：

Oka, Kengo ^{[1
]}

Azuma, Masaki ^{[1
]}

Chen, Wei-tin ^{[1
,2
,3
]}

Yusa, Hitoshi ^{[4
]}

Belik, Alexei A. ^{[5
]}

Takayama-Muromachi, Eiji ^{[5
]}

Mizumaki, Masaichiro ^{[6
]}

Ishimatsu, Naoki ^{[7
]}

Hiraoka, Nozomu ^{[8
]}

Tsujimoto, Masahiko ^{[9
]}

Tucker, Matthew G. ^{[10
]}

Attfield, J. Paul ^{[2
,3
]}

Shimakawa, Yuichi ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

[2] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JZ, Midlothian, Scotland

[4] Natl Inst Mat Sci, Exploratory Nanomat Lab, Tsukuba, Ibaraki 3050044, Japan

[5] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

[6] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

[7] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[8] Natl Synchrotron Radiat Res Ctr NSRRC, Taipei 30076, Taiwan

[9] Kyoto Univ, Inst Integrated Cell Mat Sci, Kyoto 6068501, Japan

[10] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 27期

基金：

日本学术振兴会; 英国工程与自然科学研究理事会;

关键词：

NEUTRON POWDER DIFFRACTION; CURIE-TEMPERATURE; SPECTROSCOPY; CRYSTAL;

D O I：

10.1021/ja102987d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structural and electronic properties of BiCoO3 under high pressure have been investigated. Synchrotron X-ray and neutron powder diffraction studies show that the structure changes from a polar PbTiO3 type to a centrosymmetric GdFeO3 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 Co3+ 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 BiCoO3 has been constructed enabling the transition temperature at ambient pressure to be estimated as 800-900 K.

引用

页码：9438 / 9443

页数：6

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