Second-order transition(2) S.J.T.U. Phase Transformation and Applications ds=dt-ar T dp ds,=dsB dsas。-0-CsC≥rm-eas-ra,p Teq VA=VR=V ACp The thermal expansion dTeg VTe△a coefficient does change! dp △ dTeg △B SJTU Thermodynamics of Materials Spring2018©X.J.Jin Lecture 8 Chemical equilibriumPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2018 © X. J. Jin Lecture 8 Chemical equilibrium Second-order transition (2) dp T V dT T C d S p p         = − dS A = dS B ( ) e q B B A A e q e q p B p A A B dT V V dp T C C dS dS −  −  − − = = , , 0 V A =V B =V   = e q p e q e q VT C dT dp The thermal expansion coefficient does change!     = e q e q dT dp