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

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)19397-19403
ページ数7
ジャーナルJournal of the American Chemical Society
141
49
DOI
出版ステータス出版済み - 12 11 2019

All Science Journal Classification (ASJC) codes

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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