Superconductivity:an example S.J.T.U. Phase Transformation and Applications 2 C。-C,=T4 ≠0 atT-To Normal state Super conducting state Tc→ Figure 4.8 Critical temperature as a function of magnetic field for a superconducting material. 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 Superconductivity: an example 0 2 0 ⎟ ≠ ⎠⎞ ⎜⎝⎛ Η∂ −=− dT =TatT c sn VTCC cμ