Abstract
The frequency dependences of the longitudinal and transverse permittivities of oriented nematic liquid crystals belonging to the alkylcyanobiphenyl group nCB (n=5–8) are measured in the relaxation region in the meter and decimeter wavelength ranges. It is established that the dispersion of the longitudinal permittivity is well approximated by the sum of two Debye processes with different relaxation times. The frequency dependence of the transverse permittivity is represented by the dispersion relation with a continuous distribution of relaxation times in a specified time range. It is demonstrated that, in the high-frequency range (f>200 MHz), in which the dielectric spectra exhibit a number of weakly pronounced dispersion features, the total dispersion of the permittivity is adequately described by the sum of relaxation and resonance processes.
Similar content being viewed by others
References
L. M. Blinov, Electro-Optical and Magneto-Optical Properties of Liquid Crystals (Nauka, Moscow, 1978; Wiley, New York, 1983).
D. A. Dunmur, M. R. Manterfield, W. H. Miller, and J. K. Dunleavy, Mol. Cryst. Liq. Cryst. 45, 127 (1978).
G. Meier and A. Saupe, Mol. Cryst. 1, 515 (1966).
P. G. Gummins, D. A. Dunmur, and D. A. Laidler, Mol. Cryst. Liq. Cryst. 30, 109 (1975).
B. R. Ratna and R. Shashidar, Mol. Cryst. Liq. Cryst. 42, 185 (1977).
D. Lippens, J. P. Parneix, and A. Chapoton, J. Phys. (Paris) 38, 1465 (1977).
J. M. Wacrenier, C. Druon, and D. Lippens, Mol. Phys. 43(1), 97 (1981).
C. Druon and J. M. Wacrenier, J. Phys. (Paris) 38, 47 (1977).
B. A. Belyaev, N. A. Drokin, V. F. Shabanov, and V. N. Shepov, Fiz. Tverd. Tela (St. Petersburg) 42(5), 956 (2000) [Phys. Solid State 42, 987 (2000)].
B. A. Belyaev, N. A. Drokin, V. F. Shabanov, and V. N. Shepov, Pis’ma Zh. Éksp. Teor. Fiz. 66(4), 251 (1997) [JETP Lett. 66, 271 (1997)].
B. A. Belyaev, N. A. Drokin, V. F. Shabanov, and V. N. Shepov, Zh. Tekh. Fiz. 72(4), 99 (2002) [Tech. Phys. 47, 470 (2002)].
A. A. Potapov and M. S. Mitsek, Dielectric Polarization (Irkutsk Gos. Univ., Irkutsk, 1986).
A. Buka, P. G. Oven, and A. H. Price, Mol. Cryst. Liq. Cryst. 51, 273 (1979).
E. I. Ryumtsev, S. G. Polushin, A. P. Kovshik, et al., Dokl. Akad. Nauk SSSR 244(6), 1344 (1979) [Sov. Phys. Dokl. 24, 118 (1979)].
V. N. Tsvetkov, E. I. Ryumtsev, S. G. Polushin, and A. P. Kovshik, Dokl. Akad. Nauk SSSR 254(3), 619 (1980) [Sov. Phys. Dokl. 25, 753 (1980)].
S. Urban, B. Gestblom, and A. Würflinger, Mol. Cryst. Liq. Cryst. 331, 113 (1999).
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Tverdogo Tela, Vol. 45, No. 3, 2003, pp. 567–571.
Original Russian Text Copyright © 2003 by Belyaev, Drokin, Shabanov, Shepov.
Rights and permissions
About this article
Cite this article
Belyaev, B.A., Drokin, N.A., Shabanov, V.F. et al. Specific features of the approximation of the dielectric spectra of alkylcyanobiphenyl liquid crystals. Phys. Solid State 45, 598–602 (2003). https://doi.org/10.1134/1.1562253
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1562253