Abstract
Dielectric dispersions in the homogeneous () and the homeotropic () aligned cells in the nematic phase of PCPB/MBBA mixtures have been measured in the frequency range between 100 Hz and 1 MHz. The Cole–Cole formula accounting for DC conduction has been found to reproduce dielectric dispersions well in all of the mixtures. The crossover frequency monotonously increases with increasing the MBBA concentration. It has been also found that the strengths of dielectric anisotropy both in the high and the low frequency regions are enhanced by adding of MBBA at least below 50 mol%. The dielectric anisotropy in the present system has been discussed qualitatively on the basis of the Landau-type free energy density.
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