Mean atomic volume, Tg and electrical conductivity of13; Cux(Aso.4Teo.6)loo-x glasses

Giridhar, A and Mahadevan, Sudha (1998) Mean atomic volume, Tg and electrical conductivity of13; Cux(Aso.4Teo.6)loo-x glasses. Journal of Non-Crystalline Solids, 238 (3). pp. 225-233.

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Abstract

Results of measurements of the mean atomic volume (V)),the glass transition temperature (T g) and the electrical conductivity (a) on 12 compositions of the Cux(Aso.4Teo.6)ioo - x glasses, with x from 0 to 20 at.%, are reported and discussed. A reduction in V and a constancy of Tg are observed as Cu varies from 0 to 3 at.%. To this stage, the Cu atoms occupy interlayer positions in the layered network of the parent As 0,4Te0 ,6 glass. The a of glasses with lt; 3 at.% of Cu, are less than that of the parent glass. For Cu gt; 3 at.%, Cu forms bonds with Te and the glasses become regular three component As -Te-Cu glasses. Due to this bonding, changes in slope occur in the V as a function of composition and Tg as a function of composition at Cu content of 3 at.%. The results are examined using a model which envisages the formation of Cu2Te, As2Te3 and As structural units in these glasses. For Cu gt; 3 at.%, a decrease of the conductivity activation energy and an increase of a occur with increasing Cu content.

Item Type:	Article
Additional Information:	copyright belongs to Elsevier
Uncontrolled Keywords:	Mean automic volume;Electrical conductivity;Glass transition
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Mr. N A
Date Deposited:	19 May 2006
Last Modified:	03 May 2012 10:36
URI:	http://nal-ir.nal.res.in/id/eprint/1478

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