Cobalt-free and samarium-free permanent magnet materials based on an iron-rare earth boride

Ternary iron-praseodymium-boron alloys with 12 at.% Pr and 4 at.% B are potential high-performance permanent magnets in the bulk and respond to conventional processing methods. The magnetic phase is Fe₂₁Pr₃B with a primitive tetragonal lattice ($\text{a}\text{= 0.886}$, c = 1.224 nm). It exhibits high magnetocrystalline anisotropy with a single easy axis along [001]. The systems Fe-La-B and Fe-Nd-B have the same phase with comparable properties.