Heat-capacity study of one liquid-crystal compound with smectic-A–hexatic-B–crystal-Btransition

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Abstract
High-resolution heat capacity measurements have been carried out in the smectic-A–hexatic-B–crystal-B transitions of the compound 4-propionyl-4’-(n-heptanoyloxy)azobenzene. Qualitatively, the heat-capacity anomalies of this smectic-A–hexatic-B–crystal-B transition sequence mimic those of the smectic-C–smectic-I–smectic-G transition of racemic 4-(2’-methylbutyl)phenyl-4’-(n -nonyloxy)biphenyl-4-carboxylate. The heat-capacity data near the smectic-A–hexatic-B transition are broad and asymmetric and cannot be fitted with a power-law expression.