Abstract

The elastic diffuse scattering of long-wavelength neutrons ( lambda =4.95 AA) by niobium-oxygen BCC solid-solution alloys NbO0.026 and NbO0.036 has been studied in the (001) reciprocal plane for 0.2<4 pi sin theta / lambda <2.25 AA-1. Broad intensity peaks were found around the (100), (1/200) and (1/21/20) reciprocal lattice points. There was no small-angle scattering. The diffuse scattering due to the distortion of the lattice by random oxygens in octahedral or tetrahedral sites was calculated in the (100) and (110) directions and agreed with the experimental data only in the long-wavelength limit. The observed diffuse intensity peaks were then attributed to short-range ordering of interstitial oxygen. The authors' conclusion is that the clusters inferred by Gibala and Wert (1966) from internal friction data are not random, but correlated up to distances of the order of 20 AA, at least in (001) planes.

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