Pressure-Induced Spin-State Transition in BiCoO3

Kengo Oka, Masaki Azuma, Wei-tin Chen, Hitoshi Yusa, Alexei A. Belik, Eiji Takayama-Muromachi, Masaichiro Mizumaki, Naoki Ishimatsu, Nozomu Hiraoka, Masahiko Tsujimoto, Matthew G. Tucker, J. Paul Attfield, Yuichi Shimakawa

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)9438-9443
Number of pages6
JournalJournal of the American Chemical Society
Volume132
Issue number27
DOIs
Publication statusPublished - 14 Jul 2010

Keywords

  • NEUTRON POWDER DIFFRACTION
  • CURIE-TEMPERATURE
  • LACOO3
  • FERROELECTRICS
  • SPECTROSCOPY
  • CRYSTAL
  • BIFEO3

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