Medium range structure of amorphous Fe44Ni36B20-alloys by means of neutron-scattering at small momentum transfer

The medium range structure of amorphous Fe44Ni36B20-alloys was investigated using neutron small angle scattering with isotopic substitution and immersion technique. The bulk material contains density fluctuations but no concentration fluctuations. In addition, surface scattering is caused by surface roughness. The regions with different densities within the bulk as well as on the surface are separated by smooth boundaries. The structure of the bulk is the same with all three melt spun specimens, whereas the surface apparently differs from specimen to specimen. (orig.)