Vogel-Fulcher relationship for the dielectric permittivity of relaxor ferroelectrics

14 February 1994

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 72 (7) , 1100-1103
https://doi.org/10.1103/physrevlett.72.1100

Abstract

The low frequency dielectric response of relaxor ferroelectrics is analyzed. Following the conventional approach this response is considered as a sum of those of relaxators having an exponentially wide and smooth spectrum of the relaxation times. It is shown that the Vogel-Fulcher relationship for the positions of the temperautre maximum for the real and imaginary parts of the dielectric permittivity can be obtained as a direct consequence of gradual broadening of the spectrum with decreasing temperature. It is shown that such a Vogel-Fulcher–type relationship does not necessarily imply ‘‘freezing’’ in the system.

Keywords

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