Determination of the temperature dependent smectic C biaxial permittivity tensor ant elastic constants

Citation
Cv. Brown et al., Determination of the temperature dependent smectic C biaxial permittivity tensor ant elastic constants, MOL CRYST A, 331, 1999, pp. 2325-2332
Citations number
12
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS
ISSN journal
1058725X → ACNP
Volume
331
Year of publication
1999
Part
4
Pages
2325 - 2332
Database
ISI
SICI code
1058-725X(1999)331:<2325:DOTTDS>2.0.ZU;2-O
Abstract
The direct measurement of the smectic C bend (B-1) and splay (B-2) elastic constants and the three permittivities epsilon(1), epsilon(2) and epsilon(3 ) for the commercial material SCE8R is described. A new technique has been employed in which some of the assumptions inherent in previous measurements ([1,2]) have been removed and the inaccuracies have been reduced. This invo lves fitting the a.c. field dependence of the permittivity in the surface s tabilised chevron (C2U) geometry using continuum modelling. Data from the f itting process is combined with measurements of the homeotropic permittivit y and electro-optical measurements of the layer tilt angle and smectic cone angle.