Molecular correlation in smectic phases measured by dielectric relaxation spectroscopy

M. Buivydas; F. Gouda; M. Matuszczyk; Sven T. Lagerwall

doi:10.1117/12.299945

1 February 1998 Molecular correlation in smectic phases measured by dielectric relaxation spectroscopy

M. Buivydas, F. Gouda, M. Matuszczyk, Sven T. Lagerwall

Proceedings Volume 3318, Liquid Crystals: Physics, Technology, and Applications; (1998) https://doi.org/10.1117/12.299945
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

In the present work the dielectric relaxation related to non-collective motion of liquid crystal molecules has been studied. In the first pace we observe the relaxation around the short axis for a choice of ferroelectric and antiferroelectric materials.Additionally, for some material the non-collective motion around the long axis has been investigated. We found that for all investigated compounds, except one, the relaxation obey an Arrhenius las f equals f=0) exp(-E_a/kT) and we were able to map the activation energy changes between different smectic phase. The changes of the activation energy E_a are related to the parallel correlation between the molecules. For most of the investigated ferroelectric material we observed that the correlation increase both along the long and short molecular axes at the phase transition to the smectic C* phase. For antiferroelectric materials the parallel correlation along the long axis weakens in the smectic C_a* phase. It thus seems that antitilt layer structure is related to the low degree of molecular correlation.

Citation Download Citation

M. Buivydas, F. Gouda, M. Matuszczyk, and Sven T. Lagerwall "Molecular correlation in smectic phases measured by dielectric relaxation spectroscopy", Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); https://doi.org/10.1117/12.299945

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