Abstract
Magnetic properties and phase evolution of melt spun Pr y Fe 90− y B 10 ( y=8–11.76) nanocomposite ribbons have been studied. Based on TMA measurements and a Mössbauer analysis, four phases, Pr 2Fe 14B, Pr 2Fe 23B 3, Fe 3B and α-Fe, were found for y=8–9.5 and three phases, Pr 2Fe 14B, Pr 2Fe 23B 3 and Fe 3B, for y=10. For y=11.76, only the phase Pr 2Fe 14B was detected. An exchange coupling effect (evidenced by a Henkel plot) was found, to exist in all the ribbons if a suitable crystallization treatment was employed. In this study, optimal values for B r=9.6 kG, i H c=8.3 kOe and ( BH) max=16.2 MGOe were achieved in Pr 9.5Fe 80.5B 10. They result from a proper combination of magnetic phases in the ribbons.
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