Determination of the Partial Structure Factors of the Metallic Glass Fe₈₀B₂₀

Abstract

By X-ray diffraction and neutron diffraction using the isotopic substitution method, the partial structure factors /S

Atomic Structure of Amorphous Metallic Ni81B19

“…The value <ZB=1.70 A is in good accordance with the value of 1.72 A found for the case of Fe8oB2o [3] as well as with 1.76 A given in [25] as diameter of fourfold coordinated covalently bound boron atoms. In the following some illustrations of experimental coordination numbers will be given: Comparing experimentally derived coordination numbers with models for amorphous structures one must keep in mind that the former are not unequivocal, but that Table 2 are obtained with the minimum-minimum method, that means the Aij(R) curves were integrated between the minimum at R\ preceding and the minimum at Ru following the peak of a certain coordination sphere.…”

“…We obtained D = 8.4 g/cm 3 . From this value also the densities of the glasses with 62 Ni and 0 Ni could be calculated.…”

“…They are smaller than the corresponding widths of the first peaks of the experimental GiMNi{R) andCnsriB( = 0.4 Ä), the latter being broadened by the truncation effect. Interestingly the values of G\ are nearly equal whereas for the case of the Fe8oB2o glass [3] the metal-metalloid correlation was found to be sharper than the metal-metal correlation. This observation indicates different chemical interaction between Fe and B and between Ni and B as was supposed already from the results of [27].…”

“…The value of the normalized coefficient determinant (see [3]) is C.5, which is half of the optimum value 1. At this point a remark concerning the coherent scattering length of the so called 0 Ni must be made: When b ( 0 Ni) was taken as zero, as intended in preparing this material, it turned out during the calculation of the partial structure factors and the partial correlation functions that «BB(Ö) as we ll as GBB{R) showed a small peak at that positions where the functions aNiB($) and G^miR) have their first maximum.…”

“…By this method the partial structure factors of the metallic glass FegoB2o were determined [3]. It has been applied also for Ni-Ti [4] and Cu-Ti [5] glasses.…”