Magnetic properties of aerosol synthesized barium ferrite particles

Barium ferrite fine particles have been synthesized from ferric nitrate and barium nitrate aqueous solution by an aerosol technique. The as-received particles showed a spin-glass behavior with a history-dependent low-field magnetization below 180 K. An exothermic peak with an initial crystallization...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-09, Vol.25 (5), p.4236-4238
Main Authors: Tang, Z.X., Nafis, S., Sorensen, C.M., Hadjipanayis, G.C., Klabunde, K.J.
Format: Article
Language:English
Subjects:
Aerosols
Barium
Calorimetry
Crystallization
Ferrites
Heat treatment
Magnetic analysis
Magnetic properties
Magnetization
Temperature
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Summary:Barium ferrite fine particles have been synthesized from ferric nitrate and barium nitrate aqueous solution by an aerosol technique. The as-received particles showed a spin-glass behavior with a history-dependent low-field magnetization below 180 K. An exothermic peak with an initial crystallization temperature of 687 degrees C was found by DSC (differential scanning calorimetry) analysis. Heat treatments above this temperature greatly changed the magnetic properties and morphologies without changing the Ba/Fe atomic ratio, which was 1/12. Heat-treated samples had coercivities and saturation magnetizations as high as 5360 Oe and 70.6 emu/g, respectively.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.42580