Title :
Iron-alumina nanocomposites prepared by ball milling
Author :
Pardavi-Horvath, Martha ; Takacs, Laszlo
Author_Institution :
Inst. for Magnetics Res., George Washington Univ., DC, USA
fDate :
9/1/1992 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
