First order transitions:variation of equilibrium S.J.T.U. pressure with temperature Phase Transformation and Applications A one-component material exists at equilibrium in two physical states,A and B GA=GB Two states remain in equilibrium as temperature and pressure change,the changes in each of the molar Gibbs free energies must be the same. dG=dG SJTU Thermodynamics of Materials Spring2007©X.J.Jin Lecture 7 equilibrium IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 7 equilibrium I First order transitions: variation of equilibrium pressure with temperature = GG BA A one-component material exists at equilibrium in two physical states, A and B A = dGdG B Two states remain in equilibrium as temperature and pressure change, the changes in each of the molar Gibbs free energies must be the same