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arXiv · 2204.01241

Ferroelectric transition of a chiral molecular crystal BINOL2DMSO

Toshihiro Nomura·Takeshi Yajima·Zhuo Yang·Ryosuke Kurihara·Yuto Ishii·Masashi Tokunaga·Yasuhiro H. Matsuda·Yoshimitsu Kohama·Kenta Kimura·Tsuyoshi Kimura
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Abstract

We report dielectric, thermodynamical, acoustic, and optical properties of a chiral molecular crystal, 1,1'-bi-2-naphthol 2-dimethylsulfoxide (BINOL2DMSO). We find two successive phase transitions at Tc1=190 K and Tc2=125 K. The first transition at Tc1 is characterized by an order-disorder transition of the guest molecules DMSO along with ferroelectricity. At the second transition of Tc2, the crystal structure deforms from tetragonal to monoclinic, leading to domain formation. Low-temperature x-ray diffraction suggests that the space group changes from P4_12_12 (P4_32_12) to P4_1 (P4_3) at Tc1, and down to P112_1 at Tc2.

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Toshihiro Nomura, Takeshi Yajima, Zhuo Yang, Ryosuke Kurihara, Yuto Ishii, Masashi Tokunaga, Yasuhiro H. Matsuda, Yoshimitsu Kohama, Kenta Kimura, Tsuyoshi Kimura. 2022-04-04. Ferroelectric transition of a chiral molecular crystal BINOL2DMSO. https://doi.org/10.7566/jpsj.91.064702

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