Abstract

The phase equilibria for the ternary system were determined by sealed system DTA and quench methods. The and ternary sections are true binary systems exhibiting simple eutectic behavior. The general phase relationships are discussed and the liquidus behavior and liquid structure of the selenium rich part of the ternary are treated in detail. A nonregular thermodynamic solution model is used to describe the solution behavior and calculate the size of structural units present in the ternary liquid. A physical interpretation, in terms of these structural units, is given for the observed incipient liquid immiscibility.

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