Crystal Structures and Electronic States of High-Pressure-Synthesized (1-x)PbVO3-xBiCrO3 Solid Solutions

Hajime Yamamoto, Haruna Aizawa, Ikuya Yamada, Kaoru Toda, Atsushi Tanaka, Masaki Azuma, Yuki Sakai, Takumi Nishikubo, Hiroyuki Kimura

Research output: Contribution to journalArticlepeer-review

Abstract

Electronic states in solid-solution transition metal oxides may differ from those in their parent compounds, and this results in interesting electronic properties. In this study, the valence states and electronic properties of solid solutions of (1 − x)PbVO3− xBiCrO3 are reported. The solid solutions are successfully synthesized under high-pressure and high-temperature conditions of 5 GPa or 7 GPa and 1273 K, respectively. A change in the crystal structure from centrosymmetric monoclinic (C2/c), as in BiCrO3, to polar tetragonal (P4mm), as in PbVO3, is observed. A tetragonal-to-cubic phase transition, which results in a negative thermal expansion, was observed in 7/8PbVO3-1/8BiCrO3 at approximately 700 K. X-ray absorption spectroscopy and magnetic studies reveal that the Cr and V atoms are in the valence states 3+ and 4+, respectively, which are the same as those of the parent compounds. Thus, it was concluded that the valence state of V4+/Cr3+ and the electron localization in the (1 − x)PbVO3− xBiCrO3 solid solutions are considerably robust.

Original languageEnglish
JournalJournal of Asian Ceramic Societies
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • High-pressure synthesis
  • magnetism
  • solid solution
  • valence state

ASJC Scopus subject areas

  • Ceramics and Composites

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