Abstract
The effect of partial substitution of Nd by Pr on the magnetic properties of exchange-coupled Fe3B/Nd2Fe14B nanocomposites with compositions (Nd1−yPry)4.5Fe77B18.5 (y = 0, 0.22, 0.45 and 0.66) has been investigated. Microstructural studies were carried out and correlated with the hard magnetic properties. The substitution of Nd by Pr improves iHc and (BH)max from 0.264 T and 73 kJ m−3 in the Pr-free alloy to 0.363 T and 106 kJ m−3, respectively, in the y = 0.45 alloy. Remanence magnetization decreases marginally on substitution. An increase in the Pr content beyond y = 0.45 leads to a deterioration of the hard magnetic properties, possibly due to a weakening of the exchange coupling interactions between the hard and soft magnetic phases.
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