Polarization sign inversion and smectic-A-smectic-C surface transitions in freely suspended films of fluorinated and nonfluorinated compounds

Autor:	D. Schlauf, Christian Bahr, Cheng-Cher Huang, John W. Goodby
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Spontaneous polarization Homologous series chemistry.chemical_compound Crystallography Materials science chemistry Temperature difference Condensed Matter Physics Polarization (waves) Ferroelectricity Alkyl Electronic Optical and Magnetic Materials
Zdroj:	Ferroelectrics. 212:221-229
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150199808217369
Popis:	We report ellipsometric measurements on freely suspended films of chiral liquid-crystal compounds near their smectic-A-smectic-C transition. The temperature difference between the surface and the bulk transition is found to vary considerably within a homologous series. In two compounds possessing a fluorinated alkyl chain an unexpected sign inversion of the spontaneous polarization in the ferroelectric smectic-C phase is observed which occurs only in thin but not in thick films.
Databáze:	OpenAIRE
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