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

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

2646

Lastpage

2648

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280838

Filename

280838