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Texture growth and screw dislocations in smectic A phases
Author(s) -
Morawietz K.,
Demus D.
Publication year - 1987
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.2170221106
Subject(s) - texture (cosmology) , materials science , dislocation , rod , anisotropy , orientation (vector space) , planar , conic section , crystallography , condensed matter physics , growth velocity , optics , geometry , composite material , chemistry , image (mathematics) , mathematics , physics , computer science , artificial intelligence , medicine , alternative medicine , pathology , computer graphics (images) , endocrinology
The formation of the textures of smectic A phases was investigated. In planar oriented samples the A phases grow in the shape of rods without defects. The velocity of growth is strongly anisotropic with its maximum normal to the director orientation. In non oriented samples the smectic A texture is growing in batonnets with defect structure to give focal conic textures. The maximum growth velocity of the batonnets is parallel to the director orientation. Since this would contradict to the Wulff theorem we assume a growth mechanism with a screw dislocation.