PYROELECTRIC PROPERTIES OF CHIRAL SMECTIC PHASES

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Abstract
The temperature dependences of the pyroelectric coefficient y(T) of ferroelectric liquid crystalline L-p-decyloxy- and L-p-nonyloxybenzylidene-p'-amino-2-methylbutylcinnamate and their mixture were calculated from the measurements of their responses to heat pulses with durations of 2 x and 3 x lo-' s. The frequency dispersion of y and the spontaneous polarization P, was discovered which is consistent with the corresponding dispersion of dielectric permittivity over a frequency range lo4-2 x 10' Hz. The direct measurements of the relaxation time for spontaneous polarization (2) were performed and sharp increase in z near the SmC-SmA phase transition was observed. The effect of dipolar admixtures on ymax and Py was also discussed.

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