Regular Solution Atomistic Interpretation(3) S.J.T.0. Phase Transformation and Applications Page 9/45 For the regular solution:S=0 GM=H应=rAXB i8=H数+xB aH” H8=@XXB+xx0(XA-XB) HB=ox XS ↑ 破 Justify the algebraic form c RT in a regular solution. XA XB→ Figure 7.13 Plot of excess enthalpy of mixing versus com- position for a nonideal solution. SJTU Thermodynamics of Materials Fall 2010 X.J.Jin Lecture 13 Phase RulePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2010 © X. J. Jin Lecture 13 Phase Rule Page 9/45 Regular Solution Atomistic Interpretation (3) For the regular solution: = 0 M S A B xsM xsM G = H = ωx x T B xs M A xs M xs B x H H H x ⎟⎟⎠⎞ ⎜⎜⎝⎛ ∂∂ = + ( ) B T A B A B A xsB xx x H x x x ⎟⎟⎠⎞ ⎜⎜⎝⎛ ∂ ∂ = + ω ω ( ) A B A A B xs H B = ωx x + x ω x − x 2 A xs H B = ωx B xs GB = RT lnγ 2 ln B A x RTω γ = Justify the algebraic form of the activity coefficient in a regular solution