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Abstract
Dielectric spectroscopy investigations in the frequency range 50 Hz to 1 MHz have been carried out on a new ferroelectric liquid-crystalline material (S-(-)-4-(2-n-hexylpropionyloxy)biphenyl-4′-(3-methyl-4-decyloxy)benzoate) possessing a relatively large spontaneous polarization (P s ∼ 240 nC cm−2) and containing a lateral methyl group on the aromatic ring of the alkoxybenzoate unit. The effect of temperature on the dielectric relaxation modes has been investigated in the SmC* and N* phases. From dielectric dispersion data, relaxation frequency and dielectric strength of all detected relaxation modes have been evaluated and discussed. A new surface-like mode of relaxation frequency ∼11 kHz and dielectric strength 3.8, is seen to appear in the SmC* phase.
Acknowledgements
This work was supported by Grants No. 202/03/P011 and No. 202/05/0431 from the Grant Agency of the Czech Republic and Research Project AVOZ10100520 from the Academy of Sciences of the Czech Republic. Thanks are due to Drs Hamplova, Kaspar and Jasjit Ahuja for many helpful discussions. Authors gratefully acknowledge the financial support from CSIR and DRDO, New Delhi, India. Authors wish to thank the referee(s) for their valuable suggestions.