An Ultra Small Angle Scattering Study of Hydrogen in Metals

D. Bader 1 , H. Rauch 1 , and A. Zeilinger 2
  • 1 Atominstitut der österreichischen Universitäten, A-1020 Wien
  • 2 Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.

A diffractometer using perfect crystals in symmetric Bragg arrangement, hence being useful for both neutron and X-ray radiation, has been built. The angular resolution of that instrument is better than 1 microradian, which corresponds to a scattering vector resolution of about 10-6 Å-1. This spectrometer was equipped with a laser light adjustment system which is sensitive to the relative angular position of the two perfect crystals. The spectrometer was used for the mea­surement of neutron scattering at very low angles of hydrated niobium and vanadium samples. The experimental results show an anomalously low attenuation of the neutrons when the metal-H sample is within the solubility a region. This property is explained by a lattice gas model of atomic H in the α-phase of the system. In the two phase region (α - β) a stronger attenuation of the neutron beam occurs due to the sample now being in an ordered interstitial solution phase.

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