Molecular Relaxation in hi Ghly Ordered Orthogonal Smectic SA, SB and SE Phases

Abstract
Dielectric relaxation and calorimetric investigations were perforemed on different smectic phases. Discountinuities of the critical frequency were found at both SA-SB and SB-SE phase transitions. SA and SE structures can be regarded as two-dimensional liquid and two-dimensional crystal, respectively. The low frequency dielectric dispersion presented here demonstrates the difference btween the SE and a three-dimensional cyrstal where this phenomena is absent.

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