Results of studies of non-stoichiometric CuInS 2 semiconductor by 63 Cu and 115 In nuclear magnetic resonance are presented. It was established that deviation of the composition from stoichiometry causes a quadrupolebroadened region of the NMR spectrum to change most. In this case a central peak whose shape is governed by the chemical shift anisotropy remains unaffected. NMR spectra reveal two types of structural distortions in the nearest surroundings of the In atoms.
By a method NQR 63,65Cu the synthesized standard of covellite was studied. The experimental values of quadrupole frequency νQ and parameter of asymmetry η were used for research of distribution of electronic density and Laplacian of the electron density in area of quadrupole kernel in position of Cu1. It is set that connection of Cu - S in position of Cu1 is mainly ionic tipe, and size of gap of LUMO - HOMO diminishes with the increase of temperature.
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