Kinetic process of the commensurate (δ = 1/8)-incommensurate phase transition in thiourea

K. Hamano Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

H. Sakata Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

H. Maruyama Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan; Yamaichi Research Institute of Securities & Economics, INC., 1-14-8, Ningyo-cho, Nihonbashi, Chuo-ku, Tokyo, 103.

K. Ema Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Abstract

Careful measurements of the dielectric dispersion and spontaneous polarization of thiourea reconfirmed the existence of the ferroelectric commensurate (δ = 1/8) phase between 177.5K (T ₈ ¹) and 178.1K (T ₈ ^u) under zero bias field. The kinetic process of the field-induced C(δ = 1/8)-IC phase transition was studied by observing the time evolutions of polarization and dielectric constant. The time evolutions of both quantities were similar to those observed for the C-IC transition in Rb₂ZnCl₄ studied previously, and can be explained by our theory of time evolution of DC lattice for a first-order C-IC transition.

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Kinetic process of the commensurate (δ = 1/8)-incommensurate phase transition in thiourea

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Kinetic process of the commensurate (δ = 1/8)-incommensurate phase transition in thiourea

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