Invited paper
Ordered structures in “amorphous” Fe-B-alloys

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Abstract

Scattering experiments and High Resolution Electron Microscopy (HREM) have been performed on “amorphous” Fe-B-alloys (meltspun ribbons and rf-sputtered thin films in the composition range of 14 to 50 at% boron). The pair distribution functions obtained from the scattering experiments indicate a variation of the range of order with the composition. The HREM images show well ordered regions in the “amorphous” alloys, the mean diameter of these ordered regions is of the same size as one would predict from the scattering experiments. The findings can be explained in terms of a microcrystallite model. The effects that lead to a diffuse halo in the diffraction pattern in spite of the microcrystallinity are discussed.

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