Abstract
Dielectric properties and relaxation process of hinary mixture (MIX I) and quaternary mixture (MIX II), both composed of 4-alkylphenykarbonyloxy-4-eganophenyls and -4′-cyanobiphcnpls, have been studied by dielectric spectroscopy in the frequency rang from 5 fat to 10 GHz. Dielectric measurements have been done for two principal alignments of the N, SmAd and NR phases. In the caw of MIX II the parallel component of dielectric permittivity shows a pronounced decrease in the Sm Ad phase due to dipole-dipole correction. This anomaly is much weaker for MIX I. Lon frequency spectra for both mixtures consist of two well separated al, absorption peak. connected, respectively, with biphenyl and triphenyl ring entities. By fitting a sun of two Cole-COIF functions it was possible to compute dielectric parameters of the relaxation process observed. In both cases the relaxation times exhibit Arrhenius type behavior with activation energy higher in the NR than and N phases. At high frequencies (from 10MMz to 10GHz) a broad spectrum, originating from a number of relaxation processes, have been observed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
