Studies on Some Cu-Ge-As-Se Glasses

Giridhar, A and Mahadevan, Sudha (2000) Studies on Some Cu-Ge-As-Se Glasses. Technical Report. National Aerospace Laboratories, Bangalore, India.

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Results of measurements of the mean atomic volume(V), the glass transition temperature (Tg) and the activation energy for glass transition (Et) are reported for eleven glass compositions of the Cu-Ge-As-Se system. The compositions studied can be represented as Cux(Ge0.l25As0.25Se0.625)l00-x glasses. In the V-x, Tg-x and the Et-x data of these glasses, changes in slope are observed at an x-value of -2. The results are consistent with a picture where in, Cu atoms, up to -2 atomic percent (at. %.), occupy interlayer positions in the layered network of the parent glass, without affecting its short or medium range ordering. The results also suggest that up to -2 at. %., Cu atoms act as 'plasticizers' in the parent glass matrix, reducing its Tg. For Cugt;2 at. %, the V-x and Tg-x data are qualitatively explained with a model, according to which, with increasing Cu, formation of CuAsSe2 and As structural units take place in lieu of some of the original As2Se3 structural units of the parent glass.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Glasses;Metallic additives;Volume and glass transition temperature
Subjects: CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User: Smt Bhagya Rekha KA
Date Deposited: 21 Apr 2006
Last Modified: 24 May 2010 04:10

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