Abstract
The structure and magnetic properties of Pr 16Fe 84− x B x N z ( x=0, 2, 4, 6, 8, 10) and Pr y Fe 92− y B 8N z ( y=20, 25, 30) alloys prepared by mechanical alloying using pyrolytic boron nitride (p-BN) as one of starting materials have been investigated. It is found that with increasing the content of p-BN, the magnetic phase transforms from ferromagnetic Pr 2Fe 17- to Pr 2Fe 14B-type phase, and finally to paramagnetic Pr 1.1Fe 4B 4-type one. When the Pr 2Fe 17- and Pr 2Fe 14B-type phases coexist, the nitrogen atoms occupy interstitial sites more preferentially in the Pr 2Fe 14B-type phase than in the Pr 2Fe 17-type one. Curie temperature of Pr 2Fe 14BN δ phase is about 35 K higher than that of Pr 2Fe 14B phase, which originates from the occupation of nitrogen atoms in the interstitial sites of the Pr 2Fe 14B lattice. A coercivity as high as 23.5 kOe has been achieved for N-containing Pr–Fe–B alloys with y=25.
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