Antiferroelectric liquid crystals

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Abstract
Dielectric investigations have been undertaken in two thermotropic liquid crystal systems exhibiting a smectic A2 phase (i.e. with the layer spacing equal to twice the molecular length). The postulated antiferroelectric ordering has been supported by these measurements. There are anomalies in the dielectric constants ε∥ and ε⟩ at the N-S A2 transition and an unusual low frequency relaxation, with a slight temperature dependence, appears around this transition and in the S A phases of these systems