Publication Title

Physical Review E

Publication Date

11-15-1997

Document Type

Article

DOI

10.1103/PhysRevE.56.5575

Keywords

Spin Gas Model, Phase Transitions, Liquid Crystals, Antiphase, Mesogen, Speckle

Disciplines

Physics

Abstract

Reentrant nematic phases and smectic antiphases occur as intermediate states between two one-dimensionally ordered frustrated smectic phases, characterized by two competing and, in general, incommensurate smectic density waves. Using high-resolution x-ray diffraction, we have examined the evolution of the two density waves as a function of temperature in all phases of a mixture of polar liquid crystals octyl-and decyl-oxyphenyl nitrobenzoyloxy benzoate (47.4 mol% DB8ONO2+52.6% DB10ONO2). This mixture exhibits at temperatures below 127 degrees C the liquid-crystal phase sequence: smectic-A(d), reentrant nematic phases N-d and N-1, smectic-A(1), tilted antiphase (C) over tilde, smectic-A(2), and smectic-C-2 phases. Detailed investigations of several order-disorder transitions and the evolution of fluctuation effects in this system are reported.

Comments

Copyright 1997 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.56.5575.


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