Abstract
A new method for the estimation of the atomic-orbital (AO) potentials in infinite systems is suggested. Using this method the potentials of carbon AO's in graphite, of nitrogen and boron AO's in boron nitride, and of aluminum and nitrogen AO's in aluminum nitride were determined. The energy gap in boron nitride calculated by this method (4.4 eV) is in good agreement with the experimental value of 4.3 eV.

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