The effect of thallium addition on differential thermal analysis of glassy selenium. Part 1

Abstract

The effect of thallium on the phenomena accompanying the thermally induced structural changes in different compositions of the chalcogenide system Tl x Se1−x′, withx = 0.0 to 0.9, has been investigated using differential thermal analysis measurements. It is possible to prepare massive homogeneous glassy samples with thallium contents up to 10 at %. Glasses with some embedded crystallites are obtained up to 40 at % Tl. The coefficient of the glass-forming tendency (K gl) increases with increasing selenium content. In the binary system Tl-Se, one (or more) of the phases are likely to be more unstable with respect to crystallization than was the initially homogeneous system. The activation energy of crystallization for the glasses fromx = 0.0 to 0.3, varies from 1.0 to 4.5 eV for the low-temperature phase and from 1.7 to 2.5 eV for the high-temperature phase.