Sm2Co17 alloy nanoparticles of 10-250 nm in size were prepared by mechanochemical processing involving the co-reduction of Sm2O3 and CoO with Ca. The crystal structure of the nano-sized Sm2Co17 particles was mainly of the ordered Th2Zn17-type. When embedded in the CaO matrix the Sm,Co,, nanoparticles exhibited a high coercivity of 14.2 kOe. The CaO by-product could be removed by a carefully controlled washing process without significant oxidation of the ultrafine alloy particles. After washing, the cold-pressed powder exhibited a coercivity value of 11.8 kOe and a maximum magnetization of 92.0 emu/g under an applied field of 50 kOe. (C) 1999 Elsevier Science B.V. All rights reserved.
|Journal||Journal of Magnetism and Magnetic Materials|
|Publication status||Published - 1999|