Local Defect Structure of Highly Mobile Deuterium in Niobium

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Abstract
We report measurements of the coherent elastic diffuse scattering of thermal neutrons from the local lattice distortions around deuterium in niobium. We show unambiguously that the heretofore accepted Kanzaki force model does not describe the experimental findings. Model calculations which include relaxation-time effects of the distortion field due to rapid motion of the defect give a satisfactory agreement with the measured intensity distribution. This model provides an explanation of the absence of a Snoek relaxation and relates the defect location, the defect-induced lattice distortion, and the defect diffusion in a self-consistent way.