Abstract
There are three phase transitions for Rb 2ZnCl 4. The transition temperatures, the enthalpies of transition, and the entropies of transition are (74.6±0.15) K, (30±1) J·mol −1, (0.42±0.01) J·K −1·mol −1; (195.2±0.05) K, (6.2±0.9) J·mol −1, (0.032±0.005) J·K −1·mol −1; (303.2±0.3) K, (222±7) J·mol −1, (0.66±0.14) J·K −1·mol −1. The second transition shows a very sharp heat-capacity peak but the other two are much broader, being consistent with the soft-mode mechanism. Thermodynamic functions of Rb 2ZnCl 4 are tabulated. A comparison is made with the behaviour of ferroelectrics of the same type: K 2SeO 4 and Rb 2ZnBr 4.
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