Effect of topological thresholds on thermal behaviour of germanium telluride glasses containing metallic additive

Abstract

Differential Scanning Calorimetric (DSC) studies on AgxGe15Te85−x glasses have been undertaken over a wide range of compositions, to understand the effect of topological thresholds on thermal properties. It is found that the compositional dependence of glass transition temperature (Tg), crystallization temperature (Tc), activation energy for crystallization (∆E) and thermal stability (∆T ) show anomalies at the rigidity percolation threshold. Unusual variations also observed in different thermal properties at the composition x = 20, clearly establishes the occurrence of chemical threshold in these glasses. PACS. 61.43.-j Disordered solids -61.43.Fs Glasses -65.90.+i Other topics in thermal properties of condensed matter

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