Structural phase transition in (NH3)K3C60

K. Ishii, T. Watanuki, A. Fujiwara, H. Suematsu, Y. Iwasa, H. Shimoda, T. Takenobu, T. Mitani

Research output: Contribution to journalArticle

Abstract

Crystal structure of the ammoniated alkali fulleride, (NH3)K3C60, was studied by high resolution x-ray diffraction experiments. We found a structural phase transition at low temperature. A superstructure appears below the transition temperature, Ts ≅ 150 K, and it originates from the orientational ordering of K-NH3 pairs in the octahedral site. Below Ts, K-NH3 pairs align in an antiferroelectric fashion, which is understood by electrostatic interaction between them. We also measured a deuteration effect to the transition. Similar transition was observed in (ND3)K3C60 and difference in Ts was very little.

Original languageEnglish
Pages (from-to)571-576
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume340
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Ishii, K., Watanuki, T., Fujiwara, A., Suematsu, H., Iwasa, Y., Shimoda, H., Takenobu, T., & Mitani, T. (2000). Structural phase transition in (NH3)K3C60 Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, 340, 571-576.