Fluidlike behavior of dielectric permittivity in a wide range of temperature above and below the nematic-isotropic transition

S. J. Rzoska, J. Ziolo, W. Sułkowski, J. Jadżyn, and G. Czechowski
Phys. Rev. E 64, 052701 – Published 17 October 2001
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Abstract

Singular behavior of the static dielectric permittivity of n-alkyloxycyanobiphenyls (CnH2n+1OPhPhCN, n=6, 7) was studied above and below the nematic clearing point (TIN). On approaching the clearing point, the evolution of principal components of the nematic permittivity tensor, ɛ and ɛ, is described by the order parameter exponent β0.25. The mean value of the nematic permittivity ɛmean=(ɛ+2ɛ)/3 exhibits a singular behavior similar to that observed in the isotropic phase and that for the diameter of the coexistence curve in binary mixtures. The derivative of experimental data dɛiso(T)/dT and dɛmean(T)/dT shows the specific-heat-like behavior with universal exponents α=α0.5. Results obtained confirm the hypothesis of the fluidlike, pseudospinodal, and tricritical behavior of the isotropic to nematic phase transition. [A. Drozd-Rzoska, Phys. Rev. E 59, 5556 (1999)].

  • Received 30 March 2001

DOI:https://doi.org/10.1103/PhysRevE.64.052701

©2001 American Physical Society

Authors & Affiliations

S. J. Rzoska1, J. Ziolo1, W. Sułkowski2, J. Jadżyn3, and G. Czechowski3

  • 1Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland
  • 2Institute of Chemistry, Silesian University, Szkolna 9, 40-006 Katowice, Poland
  • 3Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

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Vol. 64, Iss. 5 — November 2001

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