5.1 THERMODYNAMIC ACTIVITY (3) S.J.T.U. Phase Transformation and Applications Pure ∫B=XBfB 1 xnf aB Standard state 0 Pure A Pure B XB SJTU Thermodynamics of Materials Spring 2007 ©X.J.Jin Lecture 8 Chemical equilibriumPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 8 Chemical equilibrium 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