Dielectric properties of ferroelectric {N(CH 3 ) 4 } 2 CoCl 4 were measured in detail, covering its all transition points. The triple D - E hysteresis loop in Phase III (4.6∼7.1°C, C 2 v 9 - P 2 1 c n ) was ascertained. The lattice distortion of this ferroelectric was determined along the three crystallographic axes by a differential-transformer type dilatometer. The pressure-coefficient of transition temperature was discussed.
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Sawada et al. (1985) studied this question.
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