Abstract
Simple two-energy level models for ternary solid solutions containing a substitutional ( u) solute and an interstitial solute ( i) can be used to extract from thermodynamic data and energy needed to insert an i-atom into an interstitial site whose nearest neighbor shell of lattice atoms contains only one U-atom. However, such models are only valid, even in the high-temperature limit, when the U-concentration is small. It has been shown that such models can be extended so as to include all interstitial site types and that the energy parameters extracted from solutions dilute in the U-component may be used to predict the solubility of the i-component up to U-contentrations of more than 10 at.%.
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