Abstract
An equation was derived which relates the change in the metastable immiscibility temperature, ΔTm, caused by a minor third component and the corresponding liquidus temperature change, ΔTl. This relation is expressed as image where Tm and Tl are the initial immiscibility temperature and liquidus temperature, respectively, S is the entropy of binary liquid, and ΔS is the change in the configurational entropy. For a qualitative estimate, the relation ΔTm∼ΔTl is satisfactory. To evaluate the above equation quantitatively, the entropy must be known. The entropy equation of Charles based on the number of nonbridging oxygen pairs and bridging oxygen atom was used and a reasonable estimate was made of the change of the immiscibility temperatures for selected systems.
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