ELECTRONIC STRUCTURE AND CHEMICAL BOND IN KN3 AND KSCN CRYSTALS
N. G. Kravchenko, A. S. Poplavnoi
Kemerovo State University, Kemerovo, Russia
Keywords: азид калия, тиоцианат калия, зонные спектры, функционал плотности, potassium azide, potassium thiocyanate, band spectra, density functional
Abstract
Crystal structure parameters, band spectra, distribution maps of the toal and partial electron densities of KN3 and KSCN are calculated from the first principles using the density functional method and the general properties and distinctions in the band spectra are analyzed. The groups of balance subbands are qualitatively similar; in the upper valence band of KN3 there is weak hybridization of p states of the complex anion and metal, which is not observed in KSCN. KSCN crystals are direct band gap materials and KN3 are indirect band gap materials. The existence of weak covalent bonding of complex anions with metal is found from the electron density distribution maps in both crystals and also between metal atoms in KSCN, which is absent in KN3.
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