Abstract
Dielectric permittivity and loss have been measured in the frequency range 0.5–3.5 MHz in nematic and isotropic phases of OBT. Measurements in the nematic region with a magnetic field greater than saturation value acting parallel to the rf electric field exhibit a Debye type dispersion of e∥ with relaxation frequency 5.3 MHz at 71° C and activation energy of 27.0 kcal/mole. The results can be explained on the basis of the molecular rotation about a transverse axis occurring under hindering nematic potential. Measurements also indicate that OBT behaves as a positive dielectric material at low frequencies and a negative dielectric material at higher frequencies.
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