• B R Ratna

      Articles written in Pramana – Journal of Physics

    • Dielectric properties of 4′-n-alkyl-4-cyanobiphenyls in their nematic phases

      B R Ratna R Shashidhar

      More Details Abstract Fulltext PDF

      The principal dielectric constants of the pentyl to octyl derivatives of 4′-n-alkyl-4-cyanobiphenyl have been measured as functions of temperature in their nematic and isotropic phases. All the compounds exhibit a strong positive dielectric anisotropy due to the presence of a large dipole moment along the major molecular axis. The principal dielectric constantsε andε as well as the anisotropy Δε decrease with increasing alkyl chain length. The experimental value of$$\bar \in = \frac{1}{3}$$ (ε+2ε) decreases with decreasing temperature, and is throughout less than the extrapolated isotropic value, in conformity with the model of antiferroelectric short range order proposed by Madhusudana and Chandrasekhar.

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