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.

[img] PDF
Mean_atomic_volume_txt.pdf
Restricted to Registered users only

Download (358kB) | Request a copy
Official URL: http://www.elsevier.com

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: Users 20 not found.
Date Deposited: 19 May 2006
Last Modified: 03 May 2012 10:36
URI: http://nal-ir.nal.res.in/id/eprint/1478

Actions (login required)

View Item View Item