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Determination of the order parameter of 4-(trans-4'-n-heptyl-cyclohexyl)isothiocyanato-benzene by means of dielectric relaxation spectroscopy

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3 Author(s)
Bauman, D. ; Fac. of Tech. Phys., Poznan Univ. of Technol., Poland ; Jadzyn, J. ; Czechowski, G.

Studies of the dielectric relaxation were made for the isotropic and nematic phases of 4-(trans-4'-n-heptylcyclohexyl)isothiocyanatobenzene, (C7H 15-CyHx-Ph-N=C=S) (7CHBT) in the frequency range from 100 kHz to 1 GHz. In the nematic phase two relaxation processes were recorded for the dielectric permittivity component measured parallel to the molecular orientation (director n&oarr;) and three relaxation processes for the perpendicular permittivity component. The elementary contributions to the total dielectric absorption are found to be of the Debye-type. The strength of the nematic potential and the nematic order parameter as a function of temperature were estimated. The results obtained were compared with the predictions of the Maier-Saupe theory

Published in:

Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:8 ,  Issue: 3 )

Date of Publication:

Jun 2001

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