Abstract
A thermodynamic solution model for prediction of the equilibrium segregation coefficients of solute elements in technetium-based binary systems is used. For this chemical element only few equilibrium binary phase diagrams are known, actually, for most systems they are not available. According to the model, the equilibrium segregation coefficients of impurities in Tc are predicted at the melting point and the type of the equilibrium binary phase diagram is estimated in the region close to pure Tc.

Key words
equilibrium binary phase diagrams, technetium, equilibrium segregation coeffcients, thermodynamic solution model

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