I am working on material which shows typical cusp in temperature dependence of real part of dielectric constant and tangent loss curve. The cusp shifts to the higher temperature with increase in frequency, thus showing Relaxor behaviour. I carried out following analysis.
1) I fitted frequency dependent dielectric constant using Cole-Cole modified Debye function to get relaxation time for different temperature. The temperature dependence of relaxation time was fitted using Arrhenius equation.
2) Peak temperature (temperature at which maxima occurs in temperature dependence of real part of dielectric constant) was found at various frequencies. This data of relaxation time =1/2.pi.f Vs. Tmax was fitted using Vogel-Fulcher law.
Both the data fits good. Now the problem is which analysis is correct as I have seen in literature, either of both approaches are used.
If I were you I would check the following reference book because there are theories used in the literature depending on the material. All these theories are mechanism dependent even though they involve some mathematical sophistication but mostly ad hoc in nature. Best Regards
You get the proper chapter free from Google!
DIELECTRIC RELAXATION PHENOMENA IN
COMPLEX MATERIALS
YURI FELDMAN, ALEXANDER PUZENKO, and YAROSLAV RYABOV1
Department of Applied Physics, The Hebrew University of Jerusalem,
Jerusalem 91904, Israel
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