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Conductivity relaxation studies on sol-gel-derived Li2O–SiO2 glasses by a heterogeneous conductor model

Published online by Cambridge University Press:  31 January 2011

S.K. Saha  and
D. Chakravorty
S.K. Saha
Affiliation:
Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 032, India
D. Chakravorty
Affiliation:
Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 032, India
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Abstract

Conductivity relaxation spectra of sol-gel-derived glasses in the system Li2O (1 – x) SiO2, with x varying from 0.15 to 0.25, have been analyzed using a heterogeneous conductor model. The latter comprises diagonal layers of phases, one of them being rich in alkali ions and the other deficient in the same. Satisfactory agreement between the experimental data and the theoretical curves has been obtained over the frequency range 100 Hz to 1 MHz. The Kohlrausch–Williams–Watts (KWW) exponent, β, has been calculated from the conductivity spectra for all the glasses. The sol-gel-derived glasses have β values smaller than those obtained in the case of the corresponding melt-quenched ones. The β value is found to be correlated to the conductivity fluctuation in the alkali-rich phase.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1442 - 1449
Copyright
Copyright © Materials Research Society 1993

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References

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