Title :
Co-Pt-B particles prepared by chemical reduction
Author :
Yiping, L. ; Tang, Z.X. ; Hadjipanayis, G.C. ; Sorensen, C.M. ; Klabunde, K.J.
Author_Institution :
Delaware Univ., Newark, DE, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The magnetic and structural properties of ultrafine Co-Pt-B particles are studied in samples near the equiatomic CoPt composition. The particles are prepared by the chemical reduction of CoCl2:6H2O and PtCl4 with NaBH4 . The as-made powders have an fcc structure, and they are magnetically soft. An fcc to fct phase transformation is observed after annealing at 700°C, resulting in coercivities up to 17.8 kOe at room temperature. The variation of coercivity with particle morphology and structure is investigated
Keywords :
X-ray chemical analysis; X-ray diffraction examination of materials; annealing; boron alloys; cobalt alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; magnetic properties of fine particles; materials preparation; platinum alloys; powder metallurgy; reduction (chemical); solid-state phase transformations; transmission electron microscope examination of materials; 700 degC; CoCl2H2O; NaBH4; PtCl4; annealing; chemical reduction; coercivities; equiatomic CoPt composition; fcc structure; fcc to fct phase transformation; magnetic properties; particle morphology; structural properties; ultrafine Co-Pt-B particles; Amorphous magnetic materials; Annealing; Chemicals; Coercive force; Magnetic anisotropy; Perpendicular magnetic anisotropy; Physics; Powders; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
