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 M displays a broad global minimum in the 20% < x < 30% range of x wherein M < 20.We show that properly homogenized samples have a lower measured fragility when compared to larger underreacted melts. The enthalpy of relaxation at T g , ∆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.
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