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

Research output: Contribution to journalArticle

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 - Dec 11 2019

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All Science Journal Classification (ASJC) codes

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

Cite this

Nishikubo, T., Sakai, Y., Oka, K., Watanuki, T., MacHida, A., Mizumaki, M., ... Azuma, M. (2019). Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar-Nonpolar Transitions. Journal of the American Chemical Society, 141(49), 19397-19403. https://doi.org/10.1021/jacs.9b10336