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The Structure and Unusual Optical Textures of Smectic C 2 Phases of New Tail‐to‐Tail Twins
Author(s) -
Weissflog W.,
Richter S.,
Dietzmann E.,
Rise J.,
Diele S.,
Schiller P.,
Pelzl G.
Publication year - 1997
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170320210
Subject(s) - crystallography , tilt (camera) , chemistry , alkyl , phase (matter) , texture (cosmology) , materials science , stereochemistry , organic chemistry , mechanical engineering , artificial intelligence , computer science , engineering , image (mathematics)
New tail‐to‐tail twins with alkyl or perfluorinated spacers were synthesized. The mesomorphic properties were studied by polarizing microscopy and X‐ray diffraction measurements. It was found that the smectic C phase is a Sc 2 phase with alternating tilt and an intercalated structure. The alternating tilt gives rise to an unusual schlieren texture which exhibits not only singularities with the strength s = ±1 but also those with s = ±1/2 and s = ±3/2.