THE STRUCTURE AND UNUSUAL OPTICAL TEXTURES OF SMECTIC C-2 PHASES OF NEW TAIL-TO-TAIL TWINS

Authors
WEISSFLOG W RIGHTER S DIETZMANN E RISSE J DIELE S SCHILLER P PELZL G
Citation
W. Weissflog et al., THE STRUCTURE AND UNUSUAL OPTICAL TEXTURES OF SMECTIC C-2 PHASES OF NEW TAIL-TO-TAIL TWINS, Crystal research and technology, 32(2), 1997, pp. 271-277
Citations number
7
Categorie Soggetti
Crystallography
Journal title
Crystal research and technology → ACNP
ISSN journal
02321300
Volume
32
Issue
2
Year of publication
1997
Pages
271 - 277
Database
ISI
SICI code
0232-1300(1997)32:2<271:TSAUOT>2.0.ZU;2-W
Abstract
New tail-to-tail twins with alkyl or perfluorinated spacers were synth esized. The mesomorphic properties were studied by polarizing microsco py and X-ray diffraction measurements. It was found that the smectic C phase is a S-C2 phase with alternating tilt and an intercalated struc ture. The alternating tilt gives rise to an unusual schlieren texture which exhibits not only singularities with the strength s = +/-1 but a lso those with s = +/-1/2 and s = +/-3/2.