Abstract
The temperature T c at which K 2 ZnBr 4 is predicted to transform from the paraelectric to the ferroelectric phase is 151 (19) K, based on the crystal structure determinations at 291 and 144 K by Fabry, Breczewski, Zuniga & Arnaiz [Acta Cryst. (1993). C49, 946-950] and the Abrahams-Kurtz-Jamieson relationship. A dielectric and heat-capacity anomaly in this material at 155 K has been reported elsewhere. The locations reported for the ZnBr 4 2- and K + ions fulfill the requirements of mirror plane symmetry above T c ; ionic displacements along the polar direction that approach but do not exceed 0.1 A and that violate the mirror symmetry on cooling through T c form the basis of the prediction and satisfy the structural criteria for ferroelectricity in the phase below the transition
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