DIELECTRIC PERMITTIVITY AND RELAXATION PHENOMENA IN SMECTIC PHASES.

L. Bata, A. Buka

Research output: Contribution to journalConference article

26 Citations (Scopus)

Abstract

Dielectric permittivities were measured on compounds having different smectic phases in broad temperature intervals. Both the parallel and the perpendicular component of permittivity are given and the variations are interpreted. The intensity of the low frequency dielectric dispersion is interpreted by Bordewijk's formula and dipole-dipole correlation. The temperature dependences of the relaxation time in the different liquid crystalline phases are given. A small break was found at the N-SmA, SmA-SmC, SmB-SmF phase transitions, an order of magnitude change at the SmA-SmB and SmC-SmB phase transition, and a definite step at the SmF-SmG phase transition. The big change at these last three phase transitions is interpreted by the appearance of the collective librational modes.

Original languageEnglish
Pages (from-to)307-320
Number of pages14
JournalMolecular crystals and liquid crystals
Volume63
Issue number1-4
Publication statusPublished - Jan 1 1980
EventProc of the Int Liq Cryst Conf, 8th, Pt A, Invited Pap - Kyoto, Jpn
Duration: Jun 30 1980Jul 4 1980

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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