Functional Transition Metal Perovskite Oxides with 6s2Lone Pair Activity Stabilized by High-Pressure Synthesis

Masaki Azuma, Hajime Hojo, Kengo Oka, Hajime Yamamoto, Keisuke Shimizu, Kei Shigematsu, Yuki Sakai

Research output: Contribution to journalReview articlepeer-review

Abstract

Perovskite ABO3 oxides that have Bi and Pb at the A site and transition metals at the B site, when stabilized by high-pressure synthesis at several gigapascals, provide a rich parameter space of fascinating properties. Stereochemical 6s2 lone pairs of Bi3+ and Pb2+ induce polar or antipolar distortions. 6s2 and 6s0 (Bi5+ and Pb4+) charge degree of freedom enable intermetallic charge transfer transitions. The structural distortion and the charge degree of freedom are coupled with magnetism of transition metals, resulting in various functionalities. In particular, we highlight magnetization reversal by electric field and polarization rotation in BiFe1−xCoxO3, negative thermal expansion in modified BiNiO3 and PbVO3, and systematic charge distribution changes in PbMO3 (M = 3d transition metal).

Original languageEnglish
Pages (from-to)329-349
Number of pages21
JournalAnnual Review of Materials Research
Volume51
DOIs
Publication statusPublished - 2021 Jul 26

Keywords

  • Electric polarization
  • High-pressure synthesis
  • Multiferroics
  • Negative thermal expansion
  • Perovskite
  • Transition metal oxide

ASJC Scopus subject areas

  • Materials Science(all)

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