Phase behaviour of an antiferroelectric liquid crystal studied by raman spectroscopy

Y. Wang, H. F. Gleeson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Roman scattering investigations were carried out on the liquid crystal, 4-(methylheptyoxycarbonyl)phenyl 4′-dodecyloxybiphenyl-4-carboxylate, which exhibits both antiferroelectric and ferroelectric phases. The occurrence, scattering intensity and position of peaks associated with different parts of the molecule are reported as a function of temperature across the solid, liquid crystalline and Isotropic phases. The results indicate a significant change in molecular configuration at the solid to liquid crystal and liquid crystal to Isotropie phase transitions, the core adopting its most planar configuration in the crystal phase. Finally, an unusual temperature dependence of the position of the Roman peak associated with the phenyl C - C stretching mode is noted within the SmC*α phase.
    Original languageEnglish
    Pages (from-to)355-]/59-[362]/66
    JournalFerroelectrics
    Volume309-312
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Antiferroelectricity
    • Ferroelectricity
    • Liquid crystal
    • Phase transition
    • Raman spectroscopy

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