Abstract
Abstract The variations of the mean atomic volume, V , the glass transition temperature, T g , and the activation energy for glass transition, E t , with composition have been reported for (As 2 Te 3 ) 1 − x Ag x and (As 2 Te 3 )(Ag 2 Te) glasses; the glasses were prepared by a two-stage melt-quenching method. For the (As 2 Te 3 ) 1− x Ag x glasses, changes in the nature of dependences of V , T g and E t occur at the composition with Ag content of 1 atomic per cent (at.%). Analysis of these results indicates that, for Ag contents ≤ 1 at.%, Ag particles are uniformly dispersed in the network of the As 2 Te 3 glass, without affecting either the short range or the medium range order of the parent glass. For Ag contents ≥ 3.5 at.%, Ag forms AgTe bonds, and the observed variation of the properties can be explained by assuming the resulting three component glasses to be homogeneous mixtures of (As 2 Te 3 ) and (Ag 2 Te) units.
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