Abstract
Thermal expansions were measured by means of a clip-type dilatometer using four strain gauge elements as a bridge circuit. Linear thermal expansions xi(i = a, b, c) of Rb2ZnCl4 single crystals were observed down to liquid helium temperature. Anomalous parts of the strains along the a- and b-directions appeared with opposite signs below T i . Anomalies along the pseudo-hexagonal c-directions are smaller than that along the other directions. The linear thermal expansion coefficients αi (i = a, b, c) showed anomalies at the successive phase transition temperatures TC2 = 73.7 K, TC1 = 195.8 K, Ti = 303.4 K. Volume thermal expansion coefficient β of this substance showed no anomaly even around each phase transition temperature. Thermal expansions of Rb2ZnCI4 and Rb2ZnBr4 were compared with each other and were discussed in the context of their relations to the heat capacity and the effect of hydrostatic pressure.
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