Crystal structure and lattice distortion of γ-NbNxand δ-NbNx
- 20 November 1980
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 13 (32) , 5833-5841
- https://doi.org/10.1088/0022-3719/13/32/008
Abstract
By means of neutron diffraction on single crystals the gamma and delta modification of NbNx is studied using samples with approximately the same x=N/Nb approximately=0.85. For the ordered gamma -NbN0.85 it was possible to refine a tetragonal distorted sodium chloride structure model in spite of the occurrence of twinning. The individual mean square displacements of the N and Nb atoms are compared with those of the disordered cubic delta -NbN0.84 and the dynamical components from previous inelastic neutron scattering investigations. For the delta -NbN0.84 single crystal only a small static distortion of the Nb and N sublattices is found. For gamma -NbN0.85 large static contributions to the mean square displacements of the N atoms occur whereas the sublattice of the Nb atoms is nearly undistorted. The group theoretical relationship between the structures of the gamma and the delta phase of NbNx is discussed.Keywords
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