Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-29T22:17:23.799Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Smit, J., Wijn, H.P.J.: Ferrites (Philips’ Technical Library, Eindhoven, The Netherlands, 1959), Chapter IX.Google Scholar
2.Pollert, E.: Crystal chemistry of magnetic oxides. Part 2: Hexagonal ferrites. Prog. Crystal Growth Charact. 11, 155 (1985).CrossRefGoogle Scholar
3.Went, J.J., Rathenau, G.W., Gorter, E.W., van Oosterhout, G.W.: Ferroxdure: A class of new permanent magnet materials. Philips Technol. Rev. 13, 194 (1952).Google Scholar
4.Nedkov, I., Kolev, S., Zadro, K., Krezhov, K., Merodiiska, T.: Crystalline anisotropy and cation distribution in nanosized quasi-spherical ferroxides particles. J. Magn. Magn. Mater. 272–276, 1175 (2004).CrossRefGoogle Scholar
5.Trojanowski, S., Gilewski, A., Warchulska, J.: Calculation of sensitivity of the integrating pulse magnetometer with the first order gradiometer. Metrol. Measure. Syst. 11, 159 (2004).Google Scholar
6.Matutes-Aquino, J., Diaz-Castanon, S., Mirabal-Garcia, M., Palomares-Sanchez, S.A.: Synthesis by coprecipitation and study of barium hexaferrites powders. Scripta Mater. 42, 295 (2000).CrossRefGoogle Scholar
7.Kolev, S., Vandenberghe, R.E., Merodiiska, T., Ghelev, Ch., Nedkov, I. Structural particularities and magnetic reversal in nanosized BaFe12O19, in Nanoscience and Nanotechnology—4, edited by Balabanova, E., and Dragieva, I. (Proceedings of the 5th Workshop on Nanostructured Materials Application and Innovation Transfer 4, Sofia, Bulgaria, 2004), p. 76.Google Scholar
8.Rezlescu, N., Rezlescu, L., Craus, M.L., Rezlescu, E.: LiFe5O8 and BaFe12O19 fine particles crystallised in glassy matrix. Cryst. Res. Technol. 34, 829 (1999).3.0.CO;2-G>CrossRefGoogle Scholar
9.Krupicka, S.: Physics of Ferrites (Akademie der Wissenschaften, Prag, Czechoslovakhia, 1973).Google Scholar
10.Kodama, R.H., Berkowitz, A.E., McNiff, E.J. Jr.Foner, S.: Surface spin disorder in NiFe2O4 nanoparticles. Phys. Rev. Lett. 77, 394 (1996).CrossRefGoogle ScholarPubMed
11.Kodama, R.H., Berkowitz, A.E.: Atomic-scale magnetic modeling of oxide nanoparticles. Phys. Rev. B 59, 6321 (1999).CrossRefGoogle Scholar