Abstract
The Mott-Littleton method (1938) for the calculation of defects in ionic lattices has been extended to include surfaces. The computational procedures derive from those developed by Norgett and Lidiard (1972). Calculations are reported for intrinsic defects at the (001) and (011) surfaces of NaCl and MgO and for Ca2+, Li+ and K+ substitution effects in NaF.