9.1 Freezing Point Depression(3) S.J.T.0. Phase Transformation and Applications Page 16/36 Ⅱ.纯液A进入溶液自由能的变化 The case for addition of material B to a A and B are immiscible in the solid state aA.l.pure=1 Form ideal solution in the liquid phase Liquid of composition xA in equilibrium with pure solid A at temperature T'below Tm 1.0 asolid= A1.pure △G=RTln 1.solution A1.pure As.pure =A ,solution A XB→ B Fig.9.2 Plot of the activity of Aiquid at T<Tm.A versus composition. SJTU Thermodynamics of Materials Fall 2011 ©X.J.Jin Lecture 14 Phase diagram IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2011 © X. J. Jin Lecture 14 Phase diagram I Page 16/36 9.1 Freezing Point Depression (3) Fig. 9.2 Plot of the activity of Aliquid at T < Tm,A versus composition. A B 1.0 a A (liquid) xB asolid=1 aA,l,pure=1 The case for addition of material B to A A and B are immiscible in the solid state Form ideal solution in the liquid phase l pure l solution a a G RT , , Δ = ln Liquid of composition xA,l in equilibrium with pure solid A at temperature T’ below Tm Al, pure = Al,solution As, pure = Al,solution II. 纯液A进入溶液自由能的变化