Silver as an additive in the As40Se30Te40 Glass

Mahadevan, Sudha and Giridhar, A (1999) Silver as an additive in the As40Se30Te40 Glass. Technical Report. National Aerospace Laboratories, Bangalore,India.

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Abstract

Results of measurements of the mean atomic volume (V) and the glass transition temperature (T i)13; of twelve AgX(Asn.4Seo ,3Tea ,3 ) O x glasses [with x from 0.3 to 30 atomic percent (at.%)] are13; reported and discussed. The V-x data has three regions. In regions (i) between x=0 and 2 and (iii)13; between x=3.5 and 30, linear decreases of V with x occur; these regions are separated by a region13; (ii) between x--2 and 3.5, in which a steeper decrease of V with x is observed. The T g of these13; glasses are invariant up to addition of 2 at.% of Ag to the parent As 40Se3OTe3o glass; for x gt; 213; at.%, Tg increases with increasing x. Analysis of the data indicate that up to 2 at.%, clusters of Ag13; atoms occupy interlayer positions in the layered network of the parent glass. For higher13; concentrations, Ag bonds with other elements. The V-x and the T g-x data can be rationalised13; with a model according to which, with progressive increase in Ag, formation of Ag 2Te and13; Ag3AsSe3 structural units (s.u.) takes place in lieu of some of the original As 2Se3 and As2Te3 s.u.13; of the glass.

Item Type:	Monograph (Technical Report)
Uncontrolled Keywords:	Glasses;Metallic additives;Volume;Glass transition temperature
Subjects:	CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mrs Manoranjitha M D
Date Deposited:	05 May 2006
Last Modified:	24 May 2010 04:11
URI:	http://nal-ir.nal.res.in/id/eprint/1251

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