Abstract
The real and imaginary parts of the dielectric function of racemic and chiral CE8 have been measured between 30 Hz and 13 MHz at temperatures between 51 and 162 °C. Low- (1 kHz) and high-(105 Hz) frequency dielectric constants reflect changes in structure of the liquid-crystal phases and differences in behavior of the two forms. The low-frequency relaxation in the ferroelectric SmC* phase, near 1500 Hz, was studied in detail as a function of temperature and dc bias. The mean relaxation time does not present an obvious systematic variation with temperature although the low-frequency dielectric constant and distribution of relaxation times do. The mean relaxation time in the SmC* phase shifts continuously to shorter times with the application of dc bias.
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