J. Phys. IV France 03 (1993) C8-291-C8-294
Small-angle neutron scattering study of amorphous isotopic Ni-Nb systemE. SVÁB1, S. BORBÉLY1, Gy. MÉSZÁROS1, S.N. ISHMAEV2 and R. GLAS3
1 Research Institute for Solid State Physics, 1525 Budapest, P.O. Box 49, Hungary
2 I.V. Kurchatov Atomic Energy Institute, 123182 Moscow, Russia
3 Laboratoire Léon Brillouin, CEN Saclay, 91191 Gif-sur-Yvette cedex, France
Inhomogeneities in amorphous Ni-Nb samples prepared from various Ni-isotopes are investigated for two compositions, Ni-44 at% and Ni-62 at% by small-angle neutron scattering (SANS) in the scattering vector range from 0.007 to 0.45 Å-1. A strong increase in the structure factors is observed below 0.04 Å-1 whereas above 0.06 Å-1 they smoothly become constant. In order to clarify the origin of SANS the total structure factors are separated into the Bhatia-Thornton partial structure functions. It is shown that, the inhomogeneities are both topological and chemical in character. A characteristic correlation length of about 180 Å is obtained.
© EDP Sciences 1993