Atomic structures and the Mossbauer effect in amorphous La(FexAl1-x)13alloys consisting of icosahedral clusters

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Abstract
Atomic structures of amorphous La(FexAl1-x)13 alloys (x=0.80, 0.85, 0.90 and 0.95) were studied by X-ray diffraction. The distance between the icosahedral cluster and the La atom is slightly reduced with the increase in x. This indicates a slight change in arrangements of the icosahedral clusters around the La atom without changing the basic structure of the icosahedral clusters. On the other hand, the concentration dependence of coordination numbers for Fe-Fe pairs in the amorphous state resembles that in the crystalline From the 57Fe Mossbauer spectra, it was revealed that local environment around Fe atoms in the La(Fe0.9Al0.1)13 alloy is very similar to that in the crystalline counterpart. The magnetic properties of the amorphous and crystalline alloys have been closely correlated with their characteristic atomic strictures.