¹Uzhhorod National University, 3, Narodna Sq., 88000 Uzhhorod, Ukraine
²Kyiv National University of Technologies and Design, 2, Nemirovich-Danchenko str., 01011 Kyiv, Ukraine
³Institute of Physics, NAS of Ukraine 46, prospect Nauky, 03680 Kyiv, Ukraine
⁴National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” 37, prospect Peremohy, 03056 Kyiv, Ukraine
⁵Institute of Experimental Physics, Slovak Academy of Sciences 47, Watsonova Str., 04001, Košice, Slovakia E-mail: studenyak@dr.com; akoval@knutd.com.ua

Abstract. Dielectric properties of composites based on planar-oriented 6СВ liquid crystal with Cu6PS5X (X = I, Br) nanoparticles at 293 K in the frequency range from 6 to 106 Hz have been studied. The concentration of nanoparticles varied from 0 up to 0.1 wt.%. It has been shown that Сu6PS5Вr nanoparticles significantly less influence the conductivity of 6CB than the Сu6PS5I nanoparticles. Moreover, at the concentrations 0.01 to 0.05 wt.% of Cu6PS5Br nanoparticles the conductivity of LC decreases. It has been assumed that the nonmonotonic dependence of 6CB conductivity on the concentration of Cu6PS5Br super-ionic nanoparticles is caused by two competing mechanisms: an increase in conductivity due to the introduction of conductive impurities with nanoparticles and a decrease in conductivity caused by adsorption of impurities on the surface of nanoparticles.

Keywords: superionic conductors, liquid crystal, dielectric permittivity, electrical conductivity, concentration dependence.

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