On Thermal Anomalies Due to Phase Transitions in Doubly and Singly Reentrant Liquid Crystals, CBOBP and OBBC

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Differential thermal analysis experiments are carried out on two reentrant liquid crystals, CBOBP and OBBC, whose phase sequences are Crystal–SA1–RN–SAd–N–I and Crystal–RN–SAd–N–I, respectively. The reentrant phase transition (RN/SAd) is accompanied by a significantly smaller thermal anomaly than the ordinary ones (SA1/RN and SAd/N). SA1/RN had a larger thermal anomaly than SAd/N. Comparatively strong temperature-dependence of the heat capacity is suggested in RN. All these findings support the picture of competing incommensurate smectic periodicities and the phenomenological optimum density theory.
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