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Closed-loop miscibility gap in sulfur–tellurium melts: structural evidence and thermodynamic modelling

This paper concerns the existence of a closed-loop miscibility gap in sulfur–tellurium liquid alloys for a concentration of 40 at.% sulfur. We first present direct structural evidence of this two-phase domain based on neutron scattering measurements. In the second part, the driving mechanisms leading to this phase separation are discussed. A structural analysis combined with thermodynamic modelling shows that the existence of this closed-loop miscibility gap is strongly related to the structural changes occurring in pure liquid tellurium.