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Raman and magnetization studies of barium ferrite powder prepared by water-in-oil microemulsion

Published online by Cambridge University Press:  31 January 2011

M. S. Chen ,
Z. X. Shen ,
X. Y. Liu  and
J. Wang
M. S. Chen*
Affiliation:
Department of Physics, National University of Singapore, Lower Kent Ridge Road, 119260, Singapore
Z. X. Shen
Affiliation:
Department of Physics, National University of Singapore, Lower Kent Ridge Road, 119260, Singapore
X. Y. Liu
Affiliation:
Department of Materials Science, National University of Singapore, Lower Kent Ridge Road, 119260, Singapore
J. Wang
Affiliation:
Department of Materials Science, National University of Singapore, Lower Kent Ridge Road, 119260, Singapore
*
a)Address correspondence to this author.[email protected]
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Abstract

Micro-Raman spectroscopy was used to study the formation of BaFe12O19 (BaM) powders derived from water-in-oil microemulsion at different calcination temperatures. With increase in the calcination temperature, the Raman spectra of the BaM powders become narrower and stronger without apparent frequency shifts of the Raman bands. The calcination temperature dependence of the Raman spectra and the magnetic properties of the BaM powders result from the crystallization rather than size effect. Our results show that there is a strong correlation between the crystallinity and the magnetic properties, which could be explained in terms of the crystallization effect on the superexchange interaction between ferric ions. The γ–Fe2O3 phase occurred in the BaM precursor and the powder calcined at 500 °C. The α–Fe2O3 phase was developed in the powders calcined at 500, 600, and 700 °C, which was not detected by x-ray diffraction. With increasing calcination temperature, the γ–Fe2O3 phase can either react with oxide containing barium to form the BaM phase or transform to the α–Fe2O3 phase. The amount of α–Fe2O3 decreases due to reaction with BaCO3 to form BaM phase at higher calcination temperature.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 483 - 487
Copyright
Copyright © Materials Research Society 2000

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