Effects of dichroic dye on the dielectric properties of ferroelectric liquid crystal mixture

The dielectric spectroscopy of the ferroelectric liquid crystal mixture FLC-6980 doped with a low concentration (similar to 2% wt/wt) of anthraquinone dye has been studied. The complex permittivity has been measured in the frequency range 100 Hz to 1 MHz in SmC* and SmA phases. Dielectric increments and the relaxation frequencies at, various temperatures have been evaluated. Our results indicate that the relaxation frequency and the SmC*-SmA transition temperature T-C*A decreases whereas the dielectric increment increases about 2.5-fold on dye addition.