5.1 THERMODYNAMIC ACTIVITY (3) S.J.T.U. Phase Transformation and Applications Pure ∫B=XBfB 1 xnf Standard state 0 Pure A Pure B XB SJTU Thermodynamics of Materials Spring2006©X.J.Jin Lecture 9 Chemical equilibrium llPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © X. J. Jin Lecture 9 Chemical equilibrium II 5.1 THERMODYNAMIC ACTIVITY (3) P BBB = fxf D D B P BB B B B f fx f f α == Pure A Pure B xB fB 1 0 a B Pure Standard state