Details

Autor(en) / Beteiligte

• Zhou, X.Z.
• Horio, I.
• Morrish, A.H.
• Li, Z.W.
• Hanawa, K.

Titel

Mossbauer and magnetic study of substituted M- and W-type barium ferrite particles

Ist Teil von

• IEEE transactions on magnetics, 1991-11, Vol.27 (6), p.4651-4653

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

1991

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• A substituted barium ferrite of the M-type, BaFe/sub 10.48/Co/sub 0.76/Ti/sub 0.76/O/sub 19/ a modified W-type (about 1 W+0.3 S, where S is referred to as a spinel block), BaFe/sub 15.80/Co/sub 1.82/Ti/sub 0.5/Zn/sub 0.78/O/sub 28.3/, and a mixed type, BaFe/sub 12.6/Co/sub 0.7/Ti/sub 0.7/Ni/sub 0.36/Zn/sub 0.64/O/sub 23/ (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 Zn/sup 2+/ and Co/sup 2+/ ions for Fe/sup 2+/ at the tetrahedral f/sub IV/ site.< >