根据最小自由能原理和向下凸曲面性质推导出估算三元系和二元系金属间化合物热力学数据的判断式，并以Mo-Si-C三元系为例，估算了三元相T(Mo5Si3C)的Gibbs生成自由能。
A criterion on the evaluation of thermodynamic data of binary andternary intermetallic compounds is derived on the basis of the minim um free energy principle and the nature of convex-downward surface. As an example, the Gibbs free energy of formation of ternary-phase T(Mo5Si3C) in the system Mo-Si-C is estimated.
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