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Quasi‐Elastic Neutron Scattering on Hydrogen in Niobium Single Crystals
Author(s) -
Stump N.,
Gissler W.,
Rubin R.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220540129
Subject(s) - niobium , single crystal , condensed matter physics , diffusion , neutron diffraction , neutron , inelastic neutron scattering , neutron scattering , materials science , momentum transfer , symmetry (geometry) , crystallography , physics , scattering , chemistry , thermodynamics , optics , geometry , nuclear physics , crystal structure , mathematics , metallurgy
Quasi‐elastic neutron scattering experiments on the system NbH 0.07 have been performed with Niobium single crystals at T = 235 and 256 °C. The width of the quasi‐elastic line has been measured 1) for fixed momentum transfer | x |, changing the angle between x and a reference plane of the crystal, and 2) dependent on | x |, the x ‐vector parallel to three symmetry directions. The results have been compared with theoretical half widths corrected for experimental resolution. They favour the tetrahedal site model assuming simple jump diffusion. However, in the (001) direction deviation from the predicted behaviour occurs and the obtained value of the mean residence time differs by a factor of two from that derived from the macroscopic diffusion constant assuming tetrahedral sites.