Numéro |
J. Phys. IV France
Volume 128, September 2005
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Page(s) | 127 - 131 | |
DOI | https://doi.org/10.1051/jp4:2005128020 |
J. Phys. IV France 128 (2005) 127-131
DOI: 10.1051/jp4:2005128020
Distribution of relaxation times in PMN single crystal
R. Grigalaitis1, J. Banys1, A. Kania2 and A. Slodczyk21 Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
2 August Chelkowski Institute of Physics, University of Silesia, Uniwersytetska 4, 40-007 Katowice, Poland
Abstract
The dielectric permittivity of PMN single crystal was
measured in the frequency range from 20 Hz to 3 GHz. Dielectric dispersion
was observed in all investigated frequency range. From the frequency
dependence of the real and imaginary parts of dielectric permittvity, the
distribution of relaxation times was calculated. The low frequency limit of
the distribution of the relaxation times diverge according to the Vogel -
Fulcher law with the freezing temperature T0 = 228 K, which is in good
agreement with mean relaxation time temperature dependence obtained from
Cole - Cole equation. Broadening of the relaxation time distribution
function at low temperatures indicates the existence of two different
components making contribution to the total dielectric spectrum of PMN.
© EDP Sciences 2005