Dielectric Properties and Phase Transition of Polydiacetylene-bis (p-Toluene Sulphonate)

Taisei Matsumoto; Simon J. Sutton; Kunihide Izumi; Hideki Miyaji; Koji Fukao; Yoshihisa Miyamoto

doi:10.1143/jpsj.65.1093

Taisei Matsumoto, Simon J. Sutton, Kunihide Izumi, Hideki Miyaji, Koji Fukao, Yoshihisa Miyamoto

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Keywords: polydiacetylene, PTS, dielectric constant, second order phase transition, antiferroelectric transition

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1996 Volume 65 Issue 4 Pages 1093-1098

DOI https://doi.org/10.1143/jpsj.65.1093

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Abstract

Dielectric constants are measured for the crystals of a polydiacetylene (PTS); dielectric anomalies are observed in the directions parallel and perpendicular to the chain axis of PTS in a temperature range including a phase transition around 195 K. The crystals of PTS show an antiferroelectric transition. We derive a Landau free energy on the basis of group theoretical analysis of both the high and low temperature phases. The anomalous dielectric behavior is discussed with the free energy.

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