Behavior of high-frequency dielectric spectra of liquid crystals nCB and nOCB

B. A. Belyaev; N. A. Drokin; V. F. Shabanov; V. N. Shepov

doi:10.1117/12.472161

27 June 2002 Behavior of high-frequency dielectric spectra of liquid crystals nCB and nOCB

B. A. Belyaev, N. A. Drokin, V. F. Shabanov, V. N. Shepov

Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472161
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland

Abstract

We investigated the dielectric dispersion of two homologous series: n-alcylcyanobiphenyls (7CB, 8CB) and n-alcyloxy- cyanobiphenyls (70CB, 80CB) both in the isotropic phase and crystal states in the frequency range from 100 MHz to 1000 MHz. For each substance the dielectric spectra can well be described by the Debye equation with one relaxation time. It has been established that additional peaks at about 170, 280, 360, 450, 550 and 600 MHz exist in all spectra. Comparative analysis of the dielectric spectra has shown when the oxygen is disposed in the mesogenic core of the molecule his effect on frequencies of the peaks is absent. But in n-alcyloxy-cyanobiphenyl substances the peaks splitting and increasing in their strength are observed. The dispersion spectra were interpreted as a sum of Debye relaxation process and of resonance type.

Citation Download Citation

B. A. Belyaev, N. A. Drokin, V. F. Shabanov, and V. N. Shepov "Behavior of high-frequency dielectric spectra of liquid crystals nCB and nOCB", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472161

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