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Volume 66, 1970
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Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function

Abstract

The empirical dielectric decay function γ(t)= exp –(t0)β may be transformed analytically to give the frequency dependent complex dielectric constant if β is chosen to be 0.50. The resulting dielectric constant and dielectric loss curves are non-symmetrical about the logarithm of the frequency of maximum loss, and are intermediate between the Cole-Cole and Davidson-Cole empirical relations. Using a short extrapolation procedure, good agreement is obtained between the empirical representation and the experimental curves for the α relaxation in polyethyl acrylate. It is suggested that the present representation would have a general application to the α relaxations in other polymers. The Hamon approximation, with a small applied correction, is valid for the present function with β= 0.50 in the range log(ωτ0) > –0.5, but cannot be used at lower frequencies.

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Article type: Paper
DOI: 10.1039/TF9706600080
Citation: Trans. Faraday Soc., 1970,66, 80-85
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    Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function

    G. Williams and D. C. Watts, Trans. Faraday Soc., 1970, 66, 80
    DOI: 10.1039/TF9706600080

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