A First-Order Transition of the Smectic A-Smectic C* in Ferroelectric Liquid Crystals

Kilit E., Yurtseven H.

FERROELECTRICS, vol.427, pp.137-142, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 427
  • Publication Date: 2012
  • Doi Number: 10.1080/00150193.2012.675830
  • Journal Name: FERROELECTRICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.137-142
  • Keywords: Dielectric constant, AC* transition, A7, HIGH SPONTANEOUS POLARIZATION, PHASE-TRANSITION, DEPENDENCE, MODEL
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

The static dielectric constant is calculated as a function of temperature using a mean field model close to the smectic A-smectic C* transition for the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl (A7). This calculation of the dielectric constant is performed for the pure optically active compound (T-c = 73.4 degrees C) and the temperature range is determined for a first-order smectic A-smectic C* transition from the mean field model. Our predicted values describe adequately the observed behaviour of the dielectric constant close to the smectic A-smectic C* transition and also the temperature range in the smectic A phase of A7.