Regular Solution Atomistic Interpretation(3) S.J.T.U. Phase Transformation and Applications Page 9/45 For the regular solution:S=0 GM=H应=or4XB aH” H3=M H日=Or4xB+x,O(A-xg X.S .S HB=r GB RTInYB 服 Justify the algebraic form c RI in a regular solution. XA A XB→ Figure 7.13 Plot of excess enthalpy of mixing versus com- position for a nonideal solution. SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 13 Phase RulePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 13 Phase Rule Page 9/45 Regular Solution Atomistic Interpretation (3) For the regular solution: S M  0 A B xs M xs G M  H x x T B xs M A xs M xs B x H H H x               B T A B A B A xs B x x x H x x x                 A B A A B xs H B x x  x  x  x 2 A xs H B x B xs GB  RT ln 2 ln B A x RT    Justify the algebraic form of the activity coefficient in a regular solution