DETERMINATION BY POLARIZED NEUTRON DIFFRACTION OF THE THREE PARTIAL STRUCTURE FACTORS OF A Co81.511B18.5 GLASS
Résumé
The three partial structure factors (PSF) of a Co81.511B18.5 glass were simultaneously measured by polarized neutron diffraction. A prepeak appears around Q = 2 Å-1 on the nuclear structure factor. The concentration-concentration PSF shows that the boron atoms are only surrounded by cobalt atoms. The following pair distances are deduced from PSF : R(Co-Co) = 2.54 Å, R(Co-B) = 2.3 Å, R(B-B) ≈ 3.6 Å. Finally the PSF calculated for the model of GASKELL are in satisfactory agreement with the measurements while a slight discrepancy is observed between experiment and the SCC FSP calculated for a packing of sticky spheres.
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