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: | Journal Article |
|---|---|
| Additional Information: | copyright belongs to Elsevier |
| Uncontrolled Keywords: | Mean automic volume;Electrical conductivity;Glass transition |
| Subjects: | CHEMISTRY AND MATERIALS > Chemistry and Materials (General) |
| Division/Department: | Materials Science Division, Materials Science Division |
| Depositing User: | Mr. N A |
| Date Deposited: | 19 May 2006 |
| Last Modified: | 03 May 2012 16:06 |
| URI: | http://nal-ir.nal.res.in/id/eprint/1478 |
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