Hysteresis and Thermal Studies on Ferroelectric Transitions in Thiourea

概要

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The hysteresis loop, the specific heat and the thermal expansion of CS (NH_2)_2 have been studied with particular reference to its ferroelectric transitions. The hysteresis loop in intermediate phase III is transformed into a dauble loop with a variation of temperature. The field dependence of the transition temperature is given by dTc/dE=+and -0.5 deg.cm/kV for the upper and lower sides of phase III, respectively. Below phase III, a decrease of the critical field is observed by applying a stress on the (100) or (001) face. A new ferroelectric loop is also observed at -102 ℃ with the spontaneous polarization of 2x10^<-4>μ coul/cm^2. The specific heat anomaly is found at -106℃ with the latent heat of 6.6±01 cal/mol. In [100] and [001] directions, expansion anomalies are found; a jump of 0.9x10^<-3> is observed especially in the [100] direction at -l05℃.
社団法人日本物理学会の論文
1962-03-05