介绍以第一原理合金电子理论为基础的系统合金科学(FP-SSA)框架中Au3Cu型有序合金的特征原子势能(CAPE)配分函数.主要创新内容如下:以基本原子团{AiAu·[(I - i)Au,iCu]}和{AiCu·[(I- i)Au,iCu]}序列的中心特征原子AiAu和iCu为结构单元序列,替代原子对和原子团,建立了合金相的特征原子排列模型；以配位原子团[(I - i)Au,iCu]对作用于特征原子势场影响的方式替代原子对能量相互作用和原子团能量相互作用方式,以特征原子势能能级代替原子对能级和原子团能级,建立了合金相的“特征原子势能相加定律”,计算合金相及其组元的平均势能；在特征原子排列的简并因数与特征原子势能能级一致的条件下建立CAPE配分函数和计算组态熵.此函数揭示了当今流行的固溶体理论的不足之处,为建立特征Gibbs能配分函数奠定了基础.
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