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Influence of microstructure and preparation methods on the magneto-crystalline structure and magnetic properties of submicron barium hexaferrite powders

Published online by Cambridge University Press:  03 March 2011

I. Nedkov ,
T. Koutzarova ,
Ch. Ghelev ,
P. Lukanov ,
D. Lisjak ,
D. Makovec ,
R.E. Vandenberghe  and
A. Gilewski
I. Nedkov*
Affiliation:
Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
T. Koutzarova
Affiliation:
Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
Ch. Ghelev
Affiliation:
Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
P. Lukanov
Affiliation:
Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
D. Lisjak
Affiliation:
“Jozef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
D. Makovec
Affiliation:
“Jozef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
R.E. Vandenberghe
Affiliation:
Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
A. Gilewski
Affiliation:
International Laboratory of High Magnetic Fields and Low Temperatures, 53-529 Wroclaw, Poland
*
a) Address all correspondence to this author. e-mail: nedkov@ie.bas.bg
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Abstract

We report studies on the correlation between the microstructure, the magneto-crystalline structure, and the magnetic properties of barium hexaferrite powders. The samples consisted of typical hexagonal plate-like particles with approximate sizes of 80, 180, and 500 nm, obtained by microemulsion, coprecipitation, and solid-state reaction techniques, respectively, and were characterized by x-ray powder diffraction and scanning and transmission electron microscopy. The hyperfine parameters of the hexaferrite powders with different particle size were investigated by Mössbauer spectroscopy. We also measured the magnetization-versus-magnetic field dependence of the submicron powders at high magnetic fields up to 30 T at 4.2 K. Finally, we comment on the surface effects observed because of particle size reduction from micron to nanoscale dimensions.

Keywords

Crystallographic structureMagnetic propertiesNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2606 - 2610
Copyright
Copyright © Materials Research Society 2006

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References

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