# Crucial effect of glass processing and melt homogenization on the fragility of non-stoichiometric chalcogenides Source: [Crucial effect of glass processing and melt homogenization on the fragility of non-stoichiometric chalcogenides]() Collection index: [llms.txt]() Data updated: 2025-10-24T18:38:53.555Z Authors: Sriram Ravindren, K. Gunasekera, Z. Tucker, A. Diebold, P. Boolchand, M. Micoulaut Published: 2013-11-25T18:02:23.000Z ## Abstract The kinetics of homogenization of binary As$\_x$Se$\_{100-x}$ melts in the As concentration range $0\\%$ $\<$ $x$ $\<$ $50\\%$ are followed in FT-Raman profiling experiments, and show that 2 gram sized melts in the middle concentration range $20\\%$ $\<$ $x$ $\<$ $30\\%$ take nearly two weeks to homogenize when starting materials are reacted at 700$^o$C. In glasses of proven homogeneity, we find molar volumes to vary non-monotonically with composition, and the fragility index ${\\cal M}$ displays a broad global minimum in the $20\\%$ $\<$ $x$ $\<$ $30\\%$ range of $x$ wherein ${\\cal M}\<$ 20. We show that properly homogenized samples have a lower measured fragility when compared to larger under-reacted melts. The enthalpy of relaxation at T$\_g$, $\\Delta$H$\_{nr}$($x$) shows a minimum in the $27\\%$ $\<$ $x$ $\<$ $37\\%$ range. The super-strong nature of melt compositions in the $20\\%$ $\<$ $x$ $\<$ $30\\%$ range suppresses melt diffusion at high temperatures leading to the slow kinetics of melt homogenization. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()