The trapping of hydrogen at nitrogen in niobium investigated by diffuse X-ray scattering

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Abstract
The diffuse X-ray scattering from the displacement field around N and H in single crystals of Nb was studied at various temperatures. The observed increase of the scattering intensity with decreasing temperature can be explained by the trapping of H by N. A trap model can describe the observed changes. The displacement fields of H and N do not add linearly. On the assumption that the force dipole tensor P=(ABB) describing the displacement fields does not change for N, the trace (A+2B) of the tensor for H is lowered by 10-20% and a tetragonality mod A-B mod /(A+2B)=0.08+or-0.02 is observed for the trapped state.