The effect of submicron ferroelectric BaTiO3 particles on the dielectric and electro-optical properties of the smectic-A liquid crystal (LC) with a high negative dielectric anisotropy is investigated. It is shown that the addition of BaTiO3 particles with a weight amount of 1% reduces insignificantly the transverse dielectric permittivity component ε⊥ of, but significantly increases the longitudinal dielectric permittivity component ε// of the smectic-A LC. As a result, the anisotropy of the dielectric permittivity Δε = ε// − ε⊥ of the smectic-A LC decreases. The addition of BaTiO3 particles shifts the dispersion ε⊥ toward lower frequencies. Both components of the electrical conductivity of LC colloid + BaTiO3 are an order of magnitude higher than of the pure LC. The threshold voltage of the homeotropic-planar transition of the colloid is twice smaller, and its velocity is 6 times higher in comparison with the pure LC. A simple model explaining qualitatively all results obtained is presented.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 10–17, October, 2017.
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Ramazanov, M.A., Imamaliyev, A.R., Humbatov, S.A. et al. Effect of Barium Titanate Particles on Dielectric and Electro-Optical Properties of a Smectic-a Liquid Crystal. Russ Phys J 60, 1659–1666 (2018). https://doi.org/10.1007/s11182-018-1265-1
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DOI: https://doi.org/10.1007/s11182-018-1265-1