Abstract
Abstract We report on high resolution x-ray measurements of two commercial ferroelectric liquid crystal mixtures. Both materials show a second order smectic A* to smectic C* phase transition. The measured tilt angle, Φp was fitted to the power law expression Φp = Φ ot −β (with the reduced temperature, t = (Tc - T)/TC; TC is the smectic A to smectic C* phase transition temperature), giving β = 0.31 ± 0.02 for one and β = 0.33 ± 0.03 for the other mixture. We discuss the discrepancy between the x-ray tilt angles and those obtained by conventional optical methods.
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