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Discontinuous dielectric reorientation in the S I phase of 4‐n‐Nonyl‐4′‐n‐nonyloxy‐azobenzene
Author(s) -
Pelzl G.,
Schiller P.,
Demus D.
Publication year - 1988
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.2170231008
Subject(s) - azobenzene , dielectric , anisotropy , planar , materials science , condensed matter physics , phase (matter) , rotation (mathematics) , field (mathematics) , domain (mathematical analysis) , domain wall (magnetism) , optics , chemistry , physics , composite material , geometry , organic chemistry , optoelectronics , mathematics , polymer , quantum mechanics , mathematical analysis , magnetic field , computer graphics (images) , computer science , pure mathematics , magnetization
Abstract Planar oriented samples with positive dielectric anisotropy were used to study the dielectric reorientation in S I phases. It was found that the dielectric reorientation is characterized by the rotation of the molecule director around the layer normal. The field‐induced deformations do not arise simultaneously in the whole sample but they start in certain regions and grow continuously by domain wall motion. Depending on the boundary conditions three types of field‐induced deformations can be observed at different thresholds. An attempt has been made to interprete this behaviour on the basis of a simple model.