Abstract
We show that the measurement of the quasielastic energy spectrumS(Q,ω) of incoherently scattered neutrons provides a direct andprecise method to determine the location of the H atom diffusing on interstitial sites in a metal lattice. At the reciprocal lattice points the spectrum contains a sharp elastic line with a relative intensity which is equal to the structure factor of the occupied sites. In a neutron scattering experiment performed on a NbH0.11 single crystal, we have measured the structure factor at the (110), (200) and (222) reflection at elevated temperatures (148°C and 280°C). Our results give clear evidence of tetrahedral site occupancy and exclude an appreciable partial occupation of octahedral (≦3%) and triangular sites (≦7%) at 280°C. These findings support the basic assumption of the Chudley Elliott theory in the study of jump diffusion models of H assuming a negligible “flight” time in the jump process between neighbouring sites.
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Lottner, V., Buchenau, U. & Fitzgerald, W.J. Incoherent structure factor of hydrogen in NbH0.11 . Z Physik B 35, 35–41 (1979). https://doi.org/10.1007/BF01322079
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DOI: https://doi.org/10.1007/BF01322079