Abstract
The switching and dielectric properties of a room temperature bicomponent antiferroelectric liquid crystal mixture have been investigated as a function of temperature and frequency. Thermodynamic, optical texture, and dielectric studies carried out on the mixture show the phase sequence of Cr←(12.0 °C)→SmIA∗←(29.1 °C)→SmCA∗←(91.5 °C)→SmC∗←(92.9 °C)→SmA∗←(106.7 °C)→Iso. Spontaneous polarization (Ps), switching time (ts), and torsional bulk viscosity (γϕ) have been determined by using polarization reversal method. Dielectric spectroscopy of the mixture in the frequency range of 0.1 Hz–10 MHz reveals, eight different modes of relaxation in the paraelectric SmA∗, ferroelectric SmC∗, antiferroelectric SmCA∗ and SmIA∗ phases. Origins of these modes have been identified with the help of frequency, temperature, and bias electric field dependence of various dielectric parameters.
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