Regular solution constant or interaction parameter defined as ω = = zN[e_ab - (e_aa + e_bb)/2] where z is coordination number, N=N_a+N_b number atoms in solution, and e_ab/aa/bb is interaction potential or bond energy, i want to calculate interaction parameter for any solution say ZnO, lets say a=Zn, and b=O. What would be the values for parameters ??