Abstract
A truncated crystal approach is applied to the hexagonal boron nitride structure and electronic properties such as work function, different band widths, energy of band-to-band transition and cohesion energy are studied and compared with tight binding, OPW methods and experimental optical and thermochemical data. It is demonstrated that whenever the relation between one-electron energy levels of a finite molecular cluster and energy states at the Brillouin zone of the crystal are established, good results can be obtained. Properties that are not amenable to calculation by simple band theories, like energy of Frenkel pair formation, point defect states and dependence on interatomic distance of various energy states, are computed by the same method and discussed with reference to experiment.