Dielectric study of the SAd - SA2 phase transition of new thermotropic liquid crystals

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Abstract
In this paper, we will report on the study, in a large frequency range, of some new thermotropic liquid crystals whose phase sequence is made up of SAd - SA2 -type transitions. At this transition, we observe a dielectric behaviour appreciably different from one sample to another : there is variation in the dielectric static anisotropy and variation in the activation energy of the «flip-flop » rotation in the parallel measurement direction. Our results confirm those obtained elsewhere by means of other investigation techniques like microscopic observations, DSC experiments and X-ray data