Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar-Nonpolar Transitions

Takumi Nishikubo*, Yuki Sakai, Kengo Oka, Tetsu Watanuki, Akihiko MacHida, Masaichiro Mizumaki, Koki Maebayashi, Takashi Imai, Takahiro Ogata, Keisuke Yokoyama, Yoichi Okimoto, Shin Ya Koshihara, Hajime Hojo, Takashi Mizokawa, Masaki Azuma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Negative thermal expansion (NTE) induced by simultaneous mechanisms, that is, charge transfer and polar-nonpolar transitions, was observed for the first time in BiNi1-xFexO3 (0.25 ≤ x ≤ 0.5). The lowerature phase was found to have a polar structure (space group of R3c) with a Bi3+ 0.5(1+x)Bi5+ 0.5(1-x)Ni2+ 1-xFe3+ xO3 charge distribution and short-range ordering of Bi3+ and Bi5+. The volume reduction upon heating that was induced by charge transfer between Bi5+ and Ni2+ decreased with increasing x because of the reduction in the amount of Ni2+. Simultaneous polar-nonpolar transition also contributed to NTE, and a composition-independent enhanced volume reduction of â¼2% was observed.

Original languageEnglish
Pages (from-to)19397-19403
Number of pages7
JournalJournal of the American Chemical Society
Volume141
Issue number49
DOIs
Publication statusPublished - 2019 Dec 11

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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