The magnetic properties of amorphous fine particles of Fe80-xCrxB20 (0
< x less than or equal to 70) were investigated by Mossbauer and magn
etization experiments. With increasing x the particles show a progress
ive change from a ferromagnetic to a disordered character. The results
reveal the existence of size (10 < phi < 150 nm) and composition dist
ribution and the presence of different iron species.