期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 132, 期 27, 页码 9438-9443出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja102987d
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [19GS0207, 19340098, 19052008]
- Elements Science and Technology Project
- Chemical Synthesis Core Research institutions
- Japan Society for the promotion of science
- NIMS
- JST
- EPSRC
- Leverhulme Trust, U.K
- STFC [ST/F001495/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [19052008] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/F001495/1] Funding Source: researchfish
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.
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