Iron-alumina nanocomposites prepared by ball milling

Author

Pardavi-Horvath, Martha ; Takacs, Laszlo

Author_Institution

Inst. for Magnetics Res., George Washington Univ., DC, USA

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

3186

Lastpage

3188

Abstract

Small magnetic particles of iron embedded in an insulating alumina matrix have been prepared by ball milling, either by direct milling of a mixture of iron and alumina powders or indirectly by ball-milling enhanced displacement reaction between magnetite and aluminum metal. The average particle size could be reduced to the 10-nm range as indicated by X-ray diffraction linewidths and SEM (scanning electron microscopy). The change in the saturation magnetization and the coercivity relates to the change of the phase composition, decrease of the particle size, and accumulation of internal stresses

Keywords

X-ray diffraction examination of materials; alumina; coercive force; ferromagnetic properties of substances; internal stresses; iron; magnetic properties of fine particles; magnetisation; nanostructured materials; particle reinforced composites; particle size; powder technology; remanence; scanning electron microscope examination of materials; 10 nm; Al₂O₃ matrix; Fe; Fe-Al₂O₃; SEM; X-ray diffraction linewidths; ball milling; ball-milling enhanced displacement reaction; coercivity; internal stresses; magnetic particles; nanocomposites; particle size; phase composition; remanent magnetization; saturation magnetization; Aluminum; Ball milling; Insulation; Iron; Magnetic particles; Nanocomposites; Powders; Saturation magnetization; Scanning electron microscopy; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179753

Filename

179753