Ionic conductivity and relaxation dynamics in lithium tellurite glasses

Ghosh, A. ; Pan, A. (1999) Ionic conductivity and relaxation dynamics in lithium tellurite glasses Physical Review B, 60 (5). pp. 3224-3229. ISSN 0163-1829

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The ionic conductivity and relaxation in the lithium tellurite glasses with varying Li2O content have been investigated in the frequency range 10 Hz to 2 MHz and in the temperature range from 373 K to just below the glass transition temperature. The composition dependences of the dc conductivity and the activation energy of these glasses have been compared with those of other glasses formed with traditional network formers such as B2O3, P2O5, and SiO2 containing the same Li+ ions as modifiers and explained in terms of composition dependent network structure of these glasses. The frequency-dependent electrical data have been analyzed in the framework of the conductivity and modulus formalisms. Both these formalisms have provided for qualitative similarities in the compositional variation of the relaxation times, interaction between the cations, and the dc conductivity. The finite frequency window has been suggested as the reason for the difference between the numerical values of the stretched exponent β obtained from the odulus formalism and the values of (1-n) obtained from the conductivity formalism.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:11789
Deposited On:13 Nov 2010 13:53
Last Modified:02 Jun 2011 06:16

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