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Advances in Condensed Matter Physics
Volume 2012, Article ID 201972, 5 pages
Research Article

Temperature Dependence of the Tilt Angle for the Smectic A-Smectic Transition in a Mixture of C7-70PDOB Ferroelectric Liquid Crystals near the Tricritical Point

1Department of Physics, Canakkale Onsekiz Mart University, 17100 Canakkale, Turkey
2Department of Physics, Middle East Technical University, 06531 Ankara, Turkey

Received 12 June 2012; Accepted 12 September 2012

Academic Editor: Durga Ojha

Copyright © 2012 Mustafa Kurt and Hamit Yurtseven. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The temperature dependence of the tilt angle is studied in the smectic phase near the smectic A-smectic tricritical point for a mixture of 70PD0B in the ferroelectric liquid crystal C7 ( ). The mean-field models with the biquadratic ( is the spontaneous polarization) and (bilinear) coupling terms in the free energy expansion are used to analyze the experimental data for the tilt angle in this binary mixture. From our analysis, the coefficients given in the free energy expansion of the mean-field models are determined. Our results show that the mean-field theory explains adequately the observed behaviour of the C7-70PD0B mixture near the tricritical point.