Approximate Calculation of Solid Surface S.J.T.U. Energy (3) Phase Transformation and Applications Page 13/42 For copper,the enthalpy of sublimation:170000 J/(g.mol) Lattice spacing,3.615 A Calculated.1400 erg/cm2 Measured,1600 erg/cm2 The surface energy of a solid depends on the crystallographic plane. The work required to create the surface y aov2 depends on the number of bonds broken per (Face diagonal) atom when the surface is created,and the Figure 4.2 Atomic packing on number of atoms per area of surface.(N/A) the (111)face of a face-centered cubic crystal. SJTU Thermodynamics of Materials Spring 2008 ©X.J.Jin Lecture 20 surfacePhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2008 © X. J. Jin Lecture 20 surface Page 13/42 Approximate Calculation of Solid Surface Energy (3) For copper, the enthalpy of sublimation: 170000 J/(g.mol) Lattice spacing, 3.615 A The surface energy of a solid depends on the crystallographic plane. The work required to create the surface γ depends on the number of bonds broken per atom when the surface is created, and the number of atoms per area of surface. (N/A) Calculated. 1400 erg/cm2 Measured, 1600 erg/cm2