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Dielectric Properties of (C60 + C70)—Ferroelectric Liquid Crystal Composite
Authors:A V Koval'chuk  N M Golovataya  A F Shevchuk  D A Naiko  E V Basiuk
Abstract:A stable composite of fullerene and ferroelectric liquid crystal (FLC) has been obtained. Analysis of the frequency dependence of imaginary part of complex dielectric permittivity showed that orientation of the liquid crystal (LC) in the composite is close to homeotropic. At temperatures above 329 K, the composite conductance is determined by the conductance of fullerene. At 344 K, the composite conductance is 3.2 × 10-8 Ω-1 m-1, and the activation energy for the temperature dependence of conductance is 0.99 eV. At temperatures below 329 K, the composite properties are determined by the LC, and the frequency dependences of the components of complex dielectric permittivity showed dispersion due to rotation of molecular dipoles around the helicoid (Goldstone mode) axis. The relaxation time is close to 1 msec and almost equal to the value obtained for homeotropically oriented LC.
Keywords:Liquid crystal  Fullerenes  Isotropic phase  Ionic conductivity
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