The (SmZr)Co Phase in Sm(CoFeCuZr) Magnets

Detailed microstructural characterization of magnets and homogenized as-cast alloys, which included X-ray diffraction Rietveld analysis, has indicated that the so-called platelet or lamellae phase is (SmZr) (CoFeCu) with the PuNi structure and lattice parameters 0.5 nm and 2.4 nm. The structural and magnetic properties of the (SmZr)Co phase were investigated. The microstructure shows two phases differing in their Zr/Sm ratio. Magnetization curves for the samples (Sm Zr )Co , (Sm Zr )Co Fe , and (Sm Zr )Co are consistent with the two-phase microstructure observed. Room temperature coercivity values of these samples are low ( 1 kOe.) Index Terms—Platelet phase, Sm(CoFeCuZr) , (SmZr)Co , SmCo magnets.