Composition dependence of effective thermal conductivity and effective thermal diffusivity of Se100−xInx (x=0, 5, 10, 15 and 20) chalcogenide glasses

Abstract

Simultaneous measurement of effective thermal conductivity (λe) and effective thermal diffusivity (χe) of twin pallets of Se100−xInx (x=0,5, 10, 15, and 20) glasses, prepared under a load of 5 tons, have been made at room temperature using the Transient Plane Source (TPS) technique. The values of λe and χe were found to increase initially with the increase of concentration of In in Se–In alloy and had their maximum at 10at.wt% of indium. For indium concentration beyond 10at.wt% of the values of effective thermal conductivity and effective thermal diffusivity decrease linearly. This is suggestive of fact that 10at.wt% of indium can be considered as a critical composition at which the alloy becomes, chemically ordered and maximum thermally stable than other composition. Further addition of indium in selenium decreases the values of λe and χe. The behaviour is explained on the basis of decrease of localized states and increase in disorderness for higher composition indium.