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The phase transition points of ferroelectric Rb 2 ZnBr 4 were re-examined by the DTA technique. The ferroelectric Curie temperature T C on heating was determined as -81°C. The incommensurate-normal transition point T 1 is 74°C. The dielectric constants in the a , b and c directions were measured in a temperature range of -150 ∼120°C covering T C and T i . The Curie-Weiss law was found to hold in the ferroelectric a direction above T C . The temperature- and applied field-dependence of the 60 Hz D - E hysteresis loop were studied in detail. The triple loop observed just below T C and the anomalous field dependence of the spontaneous polarization show the ferroelectricity in Rb 2 ZnBr 4 would be ferrielectricity in reality.
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Sawada et al. (1981) studied this question.
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