Investigation of Amorphous Fe80-xPrxB20(2≤X≤8) Alloys

The investigation of amorphous Fe_80-xPr_xB₂₀(2≤X≤8) alloyswas carried out by Mossbauer Spectroscopy. It was found that the hyperfine magnetic field, Heff(T) and the Curie temperature(Tc)decrease with the increase in Pr content for Low concentrations because Pr atoms in Fe80B20 causes a large distortion of nearest neighbours. Because of the size differences between Pr and Fe ions, the local symmetry around Fe decreases markedly. This may be most probably due to the increase in the free volume in the structure. Thus, a large number of highly disordered sites are created. In Fe80-xPrxB20the Pr atoms affect the structure only in their immediate environment. The hyperfine magnetic field, Heff(T) decreases with increase in temperature. The reduced magnetic hyperfine field versus reduced temperature follows the Handrich's model.