Temperatures and enthalpy changes are reported for the melting, clearing, and nematic-to-solid transition of the p-cyanophenyl p-(n-alkyl)benzoate (RCBz) liquid crystals. The results reveal that several solid structures exist for the RCBzs. Evidence that the transitions between the various solid forms involve conformational changes is provided by exotherms and endotherms appearing in heating and cooling cycles, respectively. The study also demonstrates that as long as melted RCBzs are not allowed to solidify they undergo repeated, reversible nematic-to-isotropic and isotropic-to-nematic transitions making them suitable for use in liquid crystal displays (LCD).