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By means of small angle neutron scattering SANS using isotopic substitution the medium range structure of the amorphous Ni 63 Nb 37 -alloy was investigated. From the coherently scattered intensi­ty in the region of small momentum transfer the total and partial Bhatia-Thornton structure factors were determined. For (Q-values down to 0.03 Å -1  no small angle scattering effect at all was observed. Compared to amorphous Ni 80 P 20  this means that apparently no small regions exits in amorphous Ni 63 Nb 37 . For 0.008 Å -1  ≤ Q ≤ 0.03 Å -1 , corresponding to correlation lengths between 800 and 200 A, however. S cc  and S NN  increase with almost constant slope of about 3.6 in the log S(Q) - logQ presentation.

Concentration- and Density-Fluctuations with Amorphous Ni 63 Nb 37 by Means of Neutron Scattering at Small Momentum Transfer (SANS)