Dielectric and Electrooptic Investigations of B Phases οf Banana-Shaped Thioesters

• Authors: M. Wierzejska-Adamowicz , D. Ossowska-Chruściel , J. Chruściel , R. Douali , Ch. Legrand , M. Marzec , A. Mikułko , A. Sikorska , S. Wróbel
• Languages of publication: EN

Abstracts

EN

Electrooptic and dielectric measurements were done for B phases of two banana-shaped homologues 1,3-phenylene bis{4-[(4-nonylo-xy-benzoyl)sulfanyl]benzoate (9OSOR) and 1,3-phenylene bis{4-[(4-dodecylo-xy-benzoyl)sulfanyl]benzoate (12OSOR). Polarizing microscopy allowed to identify B_{1} phase for 9OSOR and B_{2} phase for 12OSOR on the basis of texture observation. Spontaneous polarization measurements were performed using reversal current method. The current response to applied triangular voltage shows that B_{1} phase is a ferroelectric and B_{2} phase - antiferroelectric one for which two well separated peaks were observed. Polarization for phase B_{1} of 9OSOR is rather small and its temperature dependence is unusual for ferroelectric liquid crystals - it increases with temperature. Spontaneous polarization for B_{2} phase of 12OSOR compound is of about 600 nC/cm^{2}. Dielectric spectra measured with bias field for B_{2} phase of 12OSOR show two well separated relaxation processes. In the low frequency range the relaxation process is connected with fluctuations of ferroelectric domains. The relaxation process in the high frequency range appearing also without bias field is connected with molecular reorientation. The dielectric spectra measured for B_{1} phase of 9OSOR with and without bias voltage showed only one dielectric relaxation process connected with molecular reorientation around the short axis.

Keywords

EN

77.84.Nh; 77.84.-s; 78.20.Jq

Discipline

• 77.84.-s: Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials(for nonlinear optical materials, see 42.70.Mp; for dielectric materials in electrochemistry, see 82.45.Un)
• 77.84.Nh: Liquids, emulsions, and suspensions; liquid crystals(for structure of liquid crystals, see 61.30.-v)
• 78.20.Jq: Electro-optical effects(for electro-optical modulators, see 42.79.Hp)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 117
• Issue: 4
• Pages: 557-561

Dates

published

2010-04

Contributors

author

M. Wierzejska-Adamowicz

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

D. Ossowska-Chruściel

• Institute of Chemistry, University of Podlasie, 3-go Maja 54, 08-110 Siedlce, Poland

author

J. Chruściel

• Institute of Chemistry, University of Podlasie, 3-go Maja 54, 08-110 Siedlce, Poland

author

R. Douali

• LEMCEL, ULCO, 50 rue F. Buisson, B.P. 717, 62228 Calais, France

author

Ch. Legrand

• LEMCEL, ULCO, 50 rue F. Buisson, B.P. 717, 62228 Calais, France

author

M. Marzec

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

A. Mikułko

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

A. Sikorska

• Institute of Chemistry, University of Podlasie, 3-go Maja 54, 08-110 Siedlce, Poland

author

S. Wróbel

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.117.557