J. Phys. IV France 02 (1991) C2-209-C2-216
SYNTHESIS AND STRUCTURE OF NONSTOICHIOMETRIC δ-NbN1+y FILMSE.V. SHALAEVA, M.V. KUZNETSOV, R.S. BARYSHEV and B.V. MITROFANOV
Institute of Chemistry, Urals Division of Academy of Sciences of the USSR, Pervomayskaya 91, Sverdlovsk GSP-145, USSR
The structural state of oriented nonstoichiometric δ-NbN1.2 films (NaCl-type structure) prepared by reactive ion plasma sputtering has been studied by transmission electron microscopy and photoelectron spectroscopy. An intensive diffuse scattering has been found on the microdiffraction patterns. The diffuse scattering distribution in the reciprocal space, the regularities of intensity vanishing, as well as the dependence of diffuse scattering on the N/Nb ratio, carbon and oxygen impurity atoms have been determined. It has been concluded that the diffuse scattering observed in δ-NbN films with a nitrogen content surplus (N/Nb=1.2) is caused by the atomic displacement wave spectrum in the range of [MATH] ([MATH] is a δ-NbN reciprocal lattice vector, [MATH] corresponding to 0.9 [MATH], 0.9 [MATH]). The atom displacement waves are possibly related to δ-NbN - Nb4N5 phase transition.
© EDP Sciences 1991