Abstract

Magnetic properties, phase evolution, and coercivity mechanism of Pr deficient and B excess Pr 9 . 5 Fe 8 0 . 5 B 1 0 ribbons by refractory elements substitution have been investigated. From thermal magnetic analysis (TMA),it was found that all the selected refractory elements (Cr, Nb, V, Ti and Zr) were easy to react with excess boron and retard the formation of Pr 2 Fe 2 3 B 3 and Fe 3 B phases during annealing, leading to the presence of large amount of Pr 2 Fe 1 4 B phase. Both the finer grain size and larger volume fraction of Pr 2 Fe 1 4 B phase improved the coercivity of the ribbons remarkably from 8.3 kOe for ternary Pr 9 . 5 Fe 8 0 . 5 B 1 0 ribbons to 10.1-13.2 kOe for all chosen refractory element-substituted nanocomposites. The magnetic properties having high i H c (13.2 kOe) and high (BH) m a x (16.9 MGOe) were obtained in Pr 9 . 5 Fe 7 8 . 5 Nb 2 B 1 0 nanocomposites. The coercivity of all studied ribbons is mainly dominated by domain wall pinning judged by minor loop analysis.

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