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The effects of isothermal annealing on the magnetic properties of Pr4.5Fe77B18.5 amorphous ribbons have been investigated. Two separate reactions increasing coercive force ( Hc) were recognized during the progress of annealing. In the first reaction, hard magnetic Pr 2Fe14B particles with nanoscale diameters precipitated in the vicinity of Fe 3B and Pr2Fe23B3 particles. The precipitation of fine Pr 2Fe14B particles increased Hc largely but reduced saturation magnetization ( Ms) significantly. In the second reaction, the Pr 2Fe23B3 particles decomposed into Pr2Fe14B particles containing very fine α-Fe particles within them. This resulted in the second increase in Hc due to both the volume fraction increase of Pr2Fe14B particles and the exchange-coupling interaction between the Pr2Fe14B grains and α-Fe particles within them. This phenomenon was observed originally in the present study. In the final stages of annealing, both Hc and Ms were decreased substantially by the decomposition of Pr2Fe14B into PrFe4B4 particle in addition to the coarsening of α-Fe particles.

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Effects of Metastable Phase Formation on the Magnetic Properties of Pr&lt;SUB&gt;4.5&lt;/SUB&gt;Fe&lt;SUB&gt;77&lt;/SUB&gt;B&lt;SUB&gt;18.5&lt;/SUB&gt; Amorphous Ribbons