Dielectric Behaviour of the Nematic Phase of 4‐n‐Pentyloxyphenyl 4‐(3‐Bromo‐4‐n‐nonyloxybenzoyloxy)‐3‐ethyl‐benzoate (PBNEB)

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Abstract
Due to the high viscosity of 4‐n‐pentyloxyphenyl 4‐(3‐bromo‐4‐n‐nonyloxybenzoyloxy)‐3‐ethyl‐benzoate (PBNEB) the dielectric reorientation processes take place in the kHz and MHz range respectively. We observed two different relaxation ranges in the nematic phase from 10 Hz to 10 MHz if the measuring field is parallel to the director and one relaxation range for the perpendicular orientation. Dielectric measurements at 6.7 GHz demonstrate that at this frequency ϵ′∥ and ϵ′⊥ can be regarded as high‐frequency limit. The experimental values are discussed from the point of view of the Meier‐Maier theory.