15:48:33 Non-ideal Solution (1) S.J.T.U. Phase Transformation and Applications Page 18/46 GM≠RT∑x,lnx A single solution in this region is unstable relative to the mixture of solutions of xBI and XB2. If equilibrium were attained,the single solution would decompose into two solutions because the A xB1 XB2 B Gibbs free energy change XB→ associated with such a Figure 7.6 Plot of G versus xB for a nonideal decomposition is negative. solution,showing positive deviations from Raoult's law.(In the region between xBi and x B2,the system can minimize G by forming mixtures of two solutions,xBi and xB2.) SJTU Thermodynamics of Materials Spring2007©X.J.Jin Lecture 12 Solution IlPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 12 Solution II Page 18/46 15:48:33 Non-ideal Solution (1) A single solution in this region is unstable relative to the mixture of solutions of xB1 and xB2. If equilibrium were attained, the single solution would decompose into two solutions because the Gibbs free energy change associated with such a decomposition is negative. ≠ ∑ i M ii ln xxRTG