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本文定义了三类偏简单溶液——偏理想溶液、偏正规溶液和偏稀溶液.把 A_pB-AqC 型伪二元系中的等μ_A 或等 _A 的 A 分子当作介质,采用准晶格模型,本文得到了偏简单溶液理论,用于解释前文中用宏观热力学方法讨论过的三元系所特有的一些简单行为.和假定相结合,这个理论也适用于熔盐混合物.三元偏理想溶液的性质是ΔS~(PE)=0,ΔG~(PE)=ΔH=0三元偏正规溶液的性质是ΔS~(PE)=0,ΔG~(PE)=ΔH=Lw_(BC)x_Bx_C三元偏稀溶液的性质是在大致上 y<0.01范围内ΔG~(PE)=K_(C(G))x_C (K_(C(G))=Lw_(BC)x_(B(A))≠0)这个理论被推广至组分数大于3的体系.

Three kinds of partial simple solutions——partial ideal solution,partial regu- lar solution and partial dilute solution——were defined.Treating the iso-μ_A or iso-_A molecules A in the A_pB-A_qC pseudobinary system as medium and using the quasi-lattice model,the theory of partial simple solutions is presented to ex- plain the simple behaviour of ternary systems which was discussed by macroscopic thermodynamic method in the author's previous papers.Combining the above treat- ment with the Temkin's assumption,this theory may also be applied to the molten salt mixtures.The behaviour of the pseudobinary systems of type A_pB- A_qC may be: ΔS~(PE)=0,ΔG~(PE)=ΔH=0 for the ternary partial ideal solution;or ΔS~(PE)=0,ΔG~(PE)=ΔH=Lw_(BC)x_Bx_C for the ternary partial regular solution;or,over y<0.01 roughly speaking, ΔG~(PE)=K_(C(G))x_C (K_(C(G))=Lw_(BC)x_(B(A))≠0) for the ternary partial dilute solution;in which y=x_C/x_(C(A)), and ΔG~(PE)=-TΔS~(PE)=ΔG-RT{x_Bln[x_B/(x_B+x_C)]+x_Cln[x_C/(x_B+x_C)]},x is the mole fraction and L is Avogadro's number.The thermodynamic properties thus calculated are in agreement with the published experimental data for the systems AgCl-NaCl-RbCl,Na-Pb-Tl,Cd-Bi-Sn,Cd-Pb-Sn,Cd-Pb-Bi and C_(sat).-Fe-Ni respec- tively.This theory was extended to the systems of more than three components,