Dielectric, optical and TSM measurements on semi-perfluoro ferro- and antiferro-electric liquid crystals

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Sarmento, S (Author) Other; Carvalho, PS (Author) FCUP; Glogarova, M (Author) Other; Chaves, MR (Author) FCUP; Nguyen, HT (Author) Other; Ribeiro, MJ (Author) Other

Journal

Title: Liquid Crystals

Vol. 25

Pages: 375-385

ISSN: 0267-8292

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-77H

Abstract (EN): Two compounds with very similar chemical formulae but different phase sequences, denoted by F3H6 and P4H6, have been studied by dielectric, optical and TSM measurements, and by optical and polarization hysteresis loops. The light diffraction technique was used to measure the helical pitch (p), which was found to be nearly temperature independent. Six relaxation modes have been identified. The polarization and tilt angle results are discussed using a simple phenomenological model and fitted to the equation P-0/theta(0) approximate to (1/epsilon epsilon(0)C - Omega/C theta(0)(2))(-1). The parameters C and Omega were determined from the fitting.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11