Infra-red absorption studies were made of the localized vibrational modes that were due to the defects which were produced in Czochralski-type material by irradiation with fast neutrons, and heat-treatment. Particular attention was paid to 3 satellite bands, in the region of the A center, that were located at 839, 833 and 824/cm, respectively. A correlation of these results with published infra-red, electron paramagnetic resonance and positron annihilation data suggested that these bands should be attributed to V2O, V3O2 and V2O2 defects, respectively. Semi-empirical predictions of the vibrational frequencies of these defects were also in agreement with the above conclusion.

N.V.Sarlis, C.A.Londos, L.G.Fytros: Journal of Applied Physics, 1997, 81[4], 1645-50