RECENT STRUCTURAL RESULTS WITH AMORPHOUS ALLOYS USING NEUTRON DIFFRACTION

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Abstract
Partial structure factors and partial pair correlation functions as well as atomic distances, partial coordination numbers and short range order parameters are presented for the amorphous alloys Dy80Ni20 and Ni80P20. Comparing to partial functions obtained earlier with Ni81Bl9 and Y67Ni33 we report on striking similarities between the partial pair correlation functions between those pairs which belong to one and the same of the following groups : Group 1 : Ni -P (from Ni80P20) ; Ni-B(Ni81B19) ; Ni-Dy(Dy69Ni31) ; Ni-Y(Y67Ni33) Group 2 : P-P(Ni80P20) ; B-B(Ni81B19) ; Ni-Ni(Dy69Ni31) ; Ni-Ni (Y67Ni33) Group 3 : Ni-Ni (Ni80P20) ; Ni-Ni (Ni81B19) ; Dy-Dy (Dy69Ni31 ; Y-Y(Y67Ni33). With a-Dy69Ni31 containing 10a/o D we show that it will be possible to determine D-D correlations by neutron diffraction with an alloy made from zero-scattering Dy and from zero-scattering Ni. With a-Ni80P20 we report for the first time on the evaluation of partial structure factors in the small Q-Region which show that a-Ni80P20 consists of two phases namely a matrix a certain cNi/cp-ratio and regions with diameters of 15Å and a different cNi/cp-ratio

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