The structures and magnetic properties of melt-spun B-rich (10 at. %) and Nb-containing nanocomposite alloys, with compositions based on the formula (Nd0.75Pr0.25)yFe90−y−xNbxB10 (y=8, 10; x=0, 2, 4) have been studied. Considerable enhancement of the intrinsic coercivity, (of 657kA∕m) together with excellent energy density (of 113kJ∕m3), were observed for y=8,x=4; while for y=10 and x=2, values of 912kA∕m and 140kJ∕m3 were attained. Results are interpreted in terms of a grain size refining effect of the Nb addition and to the more complete exchange coupling of the soft grains to the hard phase grains afforded by reduced grain sizes.
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Betancourt et al. (2005) studied this question.
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