Abstract
A magnetic study of Pr 80Fe 15(B 1− x C x ) 5 alloys with low B-content (0.85⩽ x⩽1.00) in the as-cast state and annealed at 600°C has been performed. In as-cast samples, a metastable eutectic phase A 1 is present in all samples. For x=1.00 in as-cast state, coarse and quite corrosive carbides are also present. With thermal treatment at 600°C for 2 h, these phases disappear and a hard needle-like magnetic phase, known as D 1, with T C=224°C and I H C=2.4 kOe at room temperature, is the only phase observed. The coercivity of the annealed Pr 80Fe 15C 5 alloy strongly increases with decreasing temperature ( I H C=44.6 kOe at 4.2 K), confirming the high magnetocrystalline anisotropy of D 1. A comparison of the χ AC(T) curves for Pr 80Fe 15X 5, X=B, C, indicates that D 1 is different from the ternary carbide RE 2Fe 14C.
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