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13 June 1997 Comparison of Kohlrausch-Williams-Watt and power-law analyses in iron phosphate glasses
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Proceedings Volume 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications; (1997) https://doi.org/10.1117/12.276266
Event: Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, 1996, Szczyrk, Poland
Abstract
Measurements of ac conductivity and discharge current in P2O5-FeO-MO glasses were analyzed using the following procedures: (1) fitting the conductivity to the Jonscher power law, namely (sigma) ac equals A(omega) 5, (2) fitting the discharge current decay to the Kohlrausch-Williams-Watt (KWW) function; (3) estimating the stretched exponent (beta) m from the shape of the electrical modulus M''. The parameter, (beta) , obtained from KWW approach is not substantially different if compare to the value (beta) s equals 1-s obtained from the frequency dependence of conductivity. On the other hand a large difference is observed when compare (beta) s with (beta) m evaluate from the shape of electrical modulus M''. We found that Ngai's relation Wac equals (beta) mWdc is not obeyed in our glasses. The relation between activation energies Wac, Wdc and (beta) equals 1-s is also predicted by Hunt theory. It is shown that this approach is more relevant for the interpretation of dielectric relaxation in iron phosphate glasses.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Murawski and R. J. Barczynski "Comparison of Kohlrausch-Williams-Watt and power-law analyses in iron phosphate glasses", Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); https://doi.org/10.1117/12.276266
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