Title :
Mossbauer and magnetic study of substituted M- and W-type barium ferrite particles
Author :
Zhou, X.Z. ; Horio, I. ; Morrish, A.H. ; Li, Z.W. ; Hanawa, K.
Author_Institution :
Dept. of Phys., Manitoba Univ., Winnipeg, Man., Canada
fDate :
11/1/1991 12:00:00 AM
Abstract :
A substituted barium ferrite of the M-type, BaFe10.48Co 0.76Ti0.76O19 a modified W-type (about 1 W+0.3 S, where S is referred to as a spinel block), BaFe15.80 Co1.82Ti0.5Zn0.78O28.3 , and a mixed type, BaFe12.6Co0.7Ti0.7 Ni0.36Zn0.64O23 (about 0.5 M+0.5 W) were prepared using the coprecipitation salt catalysis technique. The structure of the samples was examined by X-ray diffraction and high-resolution electron microscopy. Magnetic measurements and Mossbauer spectra show that the sample of the modified W-type has the largest specific magnetization 70.2 emu/g and smallest coercivity, 660 Oe. Modified W-type barium ferrite has magnetic properties superior to the M-type; this improved material can be successfully made by increasing the number of S-blocks in the unit cell and by substituting Zn2+ and Co2+ ions for Fe2+ at the tetrahedral f IV site
Keywords :
Mossbauer effect; Neel temperature; X-ray diffraction examination of materials; barium compounds; catalysis; coercive force; electron microscope examination of materials; ferrites; magnetic properties of fine particles; magnetic recording; magnetisation; precipitation; BaFe10.48Co0.76Ti0.76O19 ; BaFe12.6Co0.7Ti0.7Ni0.36 Zn0.64O23; BaFe15.8Co1.82Ti0.5Zn0.78 O28.3; M-type Ba ferrite particles; Mossbauer spectra; Neel temperature; TEM; W-type Ba ferrite particles; X-ray diffraction; coercivity; coprecipitation salt catalysis technique; high-resolution electron microscopy; magnetic properties; magnetic recording; magnetisation; particle size; specific magnetization; tetrahedral fIV site; Barium; Coercive force; Electron microscopy; Ferrites; Magnetic materials; Magnetic properties; Magnetic variables measurement; Magnetization; X-ray diffraction; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
