DIELECTRIC PROPERTIES OF LIQUID CRYSTAL LC-1289

Abstract

Purpose. We examine experimentally the permittivity in the microwave range and approximate numerically the frequency dependences of the permittivity of a nematic liquid crystal. Methodology and Approach. At a frequency of 39 GHz, measurements of the permittivity and dielectric loss are performed using the waveguide method, and at frequencies up to 10MHz, using the capacitive method. Results. Experimental values of the permittivity of a nematic liquid crystal LC-1289 at a frequency of 39 GHz are obtained. Numerical approximation of dielectric spectra is performed. The dipole relaxation times associated with the rotation of molecules around the short and long axes and the corresponding activation energies are calculated. Theoretical and Practical Implications. The values of the permittivity and dielectric loss are obtained for evaluating the performance characteristics of the working bodies of information display devices.

Keywords

• liquid crystal
• dielectric constant
• relaxation time
• activation energy