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Abstract
The dielectric anisotropy and dispersion of the real part of permittivity of 4-pentil-4′-cyano-biphenyl (5CB) were investigated in the relaxation frequency range from 10 MHz to 500 MHz. Two frequencies f 1 = 30 MHz and f 2 = 350 MHz characterizing the change of a sign of the dielectric anisotropy were obtained. The Debye relaxation fitting procedure showed that a quality of the fits was satisfactory in defining the frequency f 1, but there were discrepancies between the experimental and fitting results for the frequency f 2. It is due to the appearance of singularities on the dielectric spectrum around 300 MHz. The dielectric spectra are interpreted as a superposition of dielectric relaxation and resonance contribution. It was shown that isotropic phase and diluted solution of 5CB in benzene display the resonance dispersion region too.