Structural imperfections in Pr/sub 2/Fe/sub 14/B magnets with additions of Al, Cu and Zn

The coercivity of melt-spun Pr-Fe-B magnets has been found to increase with small additions of Al, Cu, and Zn. Systematic high-resolution electron microscope (HREM) observations were carried out to reveal the structural changes that might occur with these substitutions. Cu additions lead to planar imperfections which are found locally along