Vogel-Fulcher Relationship for the Dielectric Permittivity of Relaxor Ferroelectrics

The low frequency dielectric response of relaxer 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 temperature 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.


Published in:
Physical Review Letters, 72, 7, 1100-1103
Year:
1994
ISSN:
0031-9007
Note:
Tagantsev, Ak Ecole Polytech Fed Lausanne,Ceram Lab,Ch-1015 Lausanne,Switzerland
Mw256
Times Cited:97
Cited References Count:11
Laboratories:




 Record created 2006-08-21, last modified 2018-12-03


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