title: A temperature-concentration (T-X) phase diagram calculated using the mean field theory for liquid crystals.
abstract: Phase-line equations for smectic-hexatic phase transitions in liquid crystals were derived using the Landau phenomenological theory. In particular, second-order transitions for the smectic-A-smectic-C (SmA-SmC) and hexatic-B-hexatic-F (or HexI) transitions were studied and the tricritical points for these transitions were located. The calculated phase-line equations were fitted (using experimental data for various liquid crystals) to construct a generalized T-X phase diagram. It was shown that the T-X phase diagram calculated from the free energy adequately describes the observed behavior of liquid crystals during smectic-hexatic transitions.
authors: Department of Physics, Middle East Technical University, 06531 Ankara, Turkey. hamit@metu.edu.tr
authors: Hamit
authors: H
authors: Yurtseven
authors: Selami
authors: S
authors: Salihoglu
authors: Huseyin
authors: H
authors: Karacali