5,7 VARIATION OF EQUILIBRIUM CONSTANT WITH TEMPERATURE S.J.T.U. Phase Transformation and Applications d(△G)=-△SdT △G°=△H°-T△S dAG)=Car- H°dr T T Multiplying by 1/T,we obtain: T aag）)=a-RInK。）)=AHrd宁） SJTU Thermodynamics of Materials Spring2008©X.J.Jin Lecture 9 electrochemistry IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 9 electrochemistry I 5.7 VARIATION OF EQUILIBRIUM CONSTANT WITH TEMPERATURE Multiplying by 1/T , we obtain: dTSGd o o )( Δ−=Δ o o o Δ−Δ=Δ STHG dT T H dT T G Gd o o o Δ − Δ )( =Δ dT T H dT T G T Gd 2 2 )( o o o Δ −= Δ − Δ ) 1()ln()( T dHKRd TG d o o Δ=−= Δ α ) 1 )(ln (T d RH Kd o Δ α −= G 1 d( ) H d( ) T T Δ = Δ o o