Abstract
Anisotropic Pr13Fe80B7 magnetic powders are obtained by shortening the disproportionation time of the hydrogenation disproportionation desorption recombination (HDDR) process. The magnetic powders with a disproportionation time of 30 min have the magnetic properties of Br=0.93 T and Mr/Ms=0.75, and show a high degree of crystal texture along the c axis, whereas the magnetic powders obtained with a prolonged disproportionation time are isotropic. A rodlike structure is observed in the 30 min-disproportionation products and is transformed into spherical morphology with a prolonged disproportionation time. It suggests that the rodlike disproportionated microstructure is very important for the formation of crystal texture in the conventional HDDR powders.
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