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Experimental investigations of a new TGBC mesophase |
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| Authors: | A. C. Ribeiro Ph. Barois Y. Galerne L. Oswald D. Guillon |
| Affiliation: | (1) Centro de Fisica da Matéria Condensada (U.L.), Av. Prof. Gama Pinto 2, 1699 Lisboa Codex, Portugal, PT;(2) Centre de Recherche Paul Pascal, CNRS, avenue A. Schweitzer, 33600 Pessac, France, FR;(3) Institut de Physique et Chimie des Matériaux de Strasbourg, Groupe des Matériaux Organiques, 23 rue du Loess, 67037 Strasbourg Cedex, France, FR |
| Abstract: | We report on optical and structural X-ray studies on a smectic C twist grain boundary phase (TGB) of a pure liquid crystalline material. It is shown that this TGB phase, which exists over a large range of temperature, is definitely different from previously reported and predicted TGB phases. The two main experimental features are: (i) the observation in planar geometry of an optical texture exhibiting a square grid pattern, and (ii) the detection of a broad Bragg ring in reciprocal space instead of one (TGB) or two (TGB) sharp rings. We suggest a few possible tracks that can be explored to understand the complex structure of this new phase. Received 25 January 1999 |
| Keywords: | PACS. 61.30.-v Liquid crystals - 61.30.Eb Experimental determinations of smectic nematic cholesteric and other structures - 61.30.Jf Defects in liquid crystals |
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