Abstract
A survey of data on the critical concentration xc for the onset of ferromagnetism in binary FexM1−x alloys, with M being a nonmagnetic component, is given. The xc values range from about 0.05 to over 0.7, with the bulk of the data for amorphous alloys centered at about 0.4. For random binary alloys a model which takes into account the effects of local environment, percolation, and frustration yields critical concentrations quite similar to those encountered in many amorphous systems.
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