Abstract
The ternary phase diagram of has been calculated using Darken's quadratic formalism for a ternary liquid in equilibrium with a regular solid solution. Liquidus isotherms have been calculated from 900° to 1450°C in 50°C increments. distribution curves have also been calculated for 0.95, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, and 0.1 mole fraction of . The calculated ternary and pseudobinary phase diagrams are in excellent agreement with available experimental data.

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