Ferroelectric and antiferroelectric modes in a new chiral thiobenzoate liquid crystal

• Type: Article in International Scientific Journal
• Date: 1996

Authors

Carvalho, PS (Author) FCUP; Chaves, MR (Author) FCUP; Destrade, C (Author) Other; Nguyen, HT (Author) Other; Glogarova, M (Author) Other

Journal

Title: Liquid Crystals

Vol. 21

Pages: 31-37

ISSN: 0267-8292

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 19 Citations

Scopus - 24 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-001-E2Z

DOI: 10.1080/02678299608033793

Abstract (EN): This work concerns the dielectric relaxation study of a new compound containing a thiobenzoate group with a fluoro substituent, which presents a sequence of antiferro-, ferri-, ferroelectric and S-C alpha* phases. The polar character of these phases was confirmed by optical hysteresis loops. Three modes with a nearly monodispersive behaviour were identified: the soft mode, the Goldstone mode and a non-collective azimuthal mode. The soft mode softens above the S-A-S-C alpha* transition and triggers another mode within the S-C alpha* phase. Moreover, a collective anti-phase azimuthal mode appears and may be the origin of the onset of the antiferroelectric S-CA* phase. A strong influence of surface interactions on the thermal hysteresis and on the dielectric constant was evident in this work.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7