Sujatha, B and Reddy, C. Narayana and Chakradhar, R P S (2010) Dielectric relaxation and ion transport in silver-boro-tellurite glasses. Philosophical Magazine, 90 (19). pp. 2635-2650. ISSN 1478-6435

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Glass systems of composition xAg2SO4-20Ag2O-(80-x) [0.50 B2O3-0.50 TeO2], where x = 5, 10, 15, 20, 25 and 30 mol% have been prepared by melt-quenching technique. Frequency- and temperature-dependent conductivity measurements have been carried out in the frequency range 10 Hz to 10 MHz and at a temperature range of 303-353 K, respectively. DC conductivities exhibit Arrhenius behavior over the entire temperature range with a single activation barrier. Addition of Ag2SO4 expands the glass network and, consequently, conductivity increases. This suggests that the structure and network expansion are the key parameters for enhancing conductivity. Impedance spectra of these glasses show a single semicircle, indicating one type of conduction. AC conductivity behavior of the glasses was analyzed using both single power law and Kolhrauh-William-Watts (KWW) stretched exponential relaxation function. The power law exponent (s) is temperature-dependent, while the stretched exponent () is insensitive to temperature. Scaling behavior has also been carried out using reduced plots of conductivity with frequency, which suggests the ion transport mechanism remains unaffected by temperature and composition.

Item Type: Article
Uncontrolled Keywords: Ion conductivity; Boro-tellurite glass; Glass network; Silver salt; Scaling behavior; Dielectric properties; Activation energy
Subjects: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Feb 2012 10:24
Last Modified: 24 Oct 2013 12:22

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