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Proceedings Paper

Comparison of Kohlrausch-Williams-Watt and power-law analyses in iron phosphate glasses
Author(s): L. Murawski; R. J. Barczynski
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Paper 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.

Paper Details

Date Published: 13 June 1997
PDF: 6 pages
Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); doi: 10.1117/12.276266
Show Author Affiliations
L. Murawski, Technical Univ. of Gdansk (Poland)
R. J. Barczynski, Technical Univ. of Gdansk (Poland)


Published in SPIE Proceedings Vol. 3181:
Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications
Andrzej Wlochowicz, Editor(s)

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