5.4 SOLID-VAPOR EQUILIBRIA (3) S.J.T.U. Phase Transformation and Applications -50,000 -100,000 Cuo stable 5 -150.000 Cu20 stable 2Cu20+02→4Cu0 s -200,000 4Cu+02→2Cu20 -250.000 -300.000 Cu stable -350,000 0 200。 400 600 800 1000 1200 Temperature (K)-> Figure 5.3 AG versus T for oxides of copper,showing regions of stability for Cu, Cu,O,and CuO. 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 5.4 SOLID-VAPOR EQUILIBRIA (3)