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The phase formation of the (Nd 0.70 Pr 0.30−x Ce x ) 2.28 Fe 13.58 B 1.14  (x = 0.10, 0.15, and 0.20; hereafter defined as Pr 20 Ce 10 , Pr 15 Ce 15  and Pr 10 Ce 20 , respectively) and (Nd 0.60 Pr 0.40−y Ce y ) 2.28 Fe 13.58 B 1.14  (y = 0.10, 0.20, and 0.30; hereafter defined as Pr 30 Ce 10 , Pr 20 Ce 20  and Pr 10 Ce 30 , respectively) alloys that were prepared via the arc-melting method was investigated experimentally. The x-ray diffraction results revealed that all alloys annealed at 1173 K for 360 h consisted of a (NdPrCe) 2 Fe 14 B main phase with a tetragonal Nd 2 Fe 14 B-typed structure (space group P4 2 /mnm) and an  α -Fe minor phase, except for the Pr 10 Ce 30  alloy, which contained an additional CeFe 2  phase. The magnetic properties of the (Nd 0.70 Pr 0.30−x Ce x ) 2.28 Fe 13.58 B 1.14  and (Nd 0.60 Pr 0.40−y Ce y ) 2.28 Fe 13.58 B 1.14  ribbons that were prepared by melt spinning were examined. The remanence (B r ) and maximum magnetic energy product ((BH) max ) of the (Nd 0.70 Pr 0.30−x Ce x ) 2.28 Fe 13.58 B 1.14  ribbons increased first and then decreased, whereas the coercivity (H cj ) of the ribbons increased with an increase in Ce content. The B r  and (BH) max  of the (Nd 0.60 Pr 0.60−y Ce y ) 2.28 Fe 13.58 B 1.14  ribbons increased, whereas the H cj  of the ribbons decreased gradually with an increase in Ce content. This changed behavior of magnetic properties is attributed to the variation of volume fraction of the  α -Fe phase and different phase formations in the melt-spun ribbons. The Curie temperatures (T c ) of all ribbons decreased slightly with Ce substitution, which results from the lower Curie temperatures of Pr 2 Fe 14 B and Ce 2 Fe 14 B. The Pr 10 Ce 30  ribbon with a higher Ce content exhibited optimal magnetic properties (B r  = 9.71 kGs, H cj  = 13.09 kOe, (BH) max  = 18.78 MGOe), which indicates that suitable magnetic properties of the Nd–Pr–Ce–Fe–B melt-spun ribbons can be achieved by alloy-composition and phase-formation design.

Effect of Ce on phase formation and magnetic properties of (Nd–Pr)2.28Fe13.58B1.14 melt-spun ribbons

Effect of Ce on phase formation and magnetic properties of (Nd–Pr)_2.28Fe_13.58B_1.14 melt-spun ribbons