Dielectric and Dilatometric Studies on Ferroelectric {N(CH₃)₄}₂CoCl₄

Abstract

Dielectric properties of ferroelectric {N(CH₃)₄}₂CoCl₄ were measured in detail, covering its all transition points. The triple D-E hysteresis loop in Phase III (4.6∼7.1°C, C_2v⁹-P2₁cn) 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.