Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-15T00:22:57.310Z Has data issue: false hasContentIssue false
  • English
  • Français

The effect of the distribution of vacancies on the magnetic properties of γ – Fe2O3 particles

Published online by Cambridge University Press:  03 March 2011

M.P. Morales ,
C. de Julián ,
J.M. González  and
C.J. Serna
M.P. Morales
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
C. de Julián
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
J.M. González*
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
C.J. Serna
Affiliation:
Instituto de Ciencia de Materiales de Madrid-CSIC, Serrano 115 dpdo., 28006 Madrid, Spain
*
a)Author to whom further correspoñdence should be addressed.
Get access

Abstract

Samples of γ-Fe2O3 have been prepared from uniform α-Fe2O3 particles obtained by homogeneous hydrolysis in solution and directly by spray pyrolysis methods. The crystalline structure of these samples was analyzed by using x-ray and electron diffraction. It was concluded that, depending on the preparation method and parameters, different degrees of order in the distribution of vacancies were present. The study of the magnetic properties of these samples included the measurement of both intrinsic (saturation magnetization) and extrinsic properties (coercive force and magnetization behavior in the approach to saturation region). It was found that all the above-mentioned quantities depended on the degree of order in the distribution of vacancies.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 1 , January 1994 , pp. 135 - 141
Copyright
Copyright © Materials Research Society 1994

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

1Schabes, M. E., J. Magn. Magn. Mater. 95, 249 (1991).CrossRefGoogle Scholar
2Morris, R. V., Lauer, H. V. Jr., Lawson, C. A., Gibson, E. K. Jr., Nace, G. A., and Steward, C., J. Geophys. Res. 90, 3126 (1985).CrossRefGoogle Scholar
3Nikumbh, A. K., Sayanekar, P. L., and Chaskas, M. G., J. Magn. Magn. Mater. 97, 119 (1991).CrossRefGoogle Scholar
4Greaves, C., J. Solid State Chem. 49, 325 (1983).CrossRefGoogle Scholar
5Matijević, E., Ann. Rev. Mater. Sci. 15, 483 (1985).CrossRefGoogle Scholar
6Corradi, A. R., Andress, S. J., French, J. E., Bottoni, G., Candolfo, D., Cecchetti, A., and Masoli, F., IEEE Trans. Magn. 20, 33 (1984).CrossRefGoogle Scholar
7González-Carreño, T., Mifsud, A., Serna, C. J., and Palacios, J. M., Mater. Chem. Phys. 27, 287 (1991).CrossRefGoogle Scholar
8Ziolo, R. F., Giannelis, E. P., Weinstein, B. A., O'Horo, M.P., Ganguly, B. N., Mehrotra, V., Russell, M. W., and Huffman, D. R., Science 257, 219 (1992).CrossRefGoogle Scholar
9González-Carreño, T., Morales, M. P., Garcia, M., and Serna, C. J., Mater. Lett, (in press).Google Scholar
10Morales, M. P., González-Carreño, T., and Serna, C.J., J. Mater. Res. 7, 2538 (1992).CrossRefGoogle Scholar
11Matijević, E. and Hsu, W. P., J. Colloid Interf. Sci. 118, 506 (1987).CrossRefGoogle Scholar
12Morales, M. P., Pecharroman, C., González-Carreño, T., and Serna, C. J., J. Solid State Chem. (in press).Google Scholar
13Martin, V. E., Bernardi, J., Fidler, J., Cebollada, F., and González, J.M., J. Alloys Compounds 191, 127 (1993).CrossRefGoogle Scholar
14Givord, D., Lienard, A., Tenaud, P., and Viadieu, T., J. Magn. Magn. Mater. 67, L-281 (1987).CrossRefGoogle Scholar
15Cebollada, F., Martin, V. E., Vázquez, M., Carmona, F., Rivero, G., and González, J. M., in Basic Features of the Glassy State, edited by Colmenero, J. and Alegria, A. (World Scientific, Singapore, 1989), p. 529.Google Scholar
16Bate, G., Ferromagnetic Materials, edited by Wohlfarth, E.P. (North-Holland Publishing Co., London, United Kingdom, 1980), p. 440.Google Scholar
17Köster, E., J. Appl. Phys. 41, 3332 (1970).CrossRefGoogle Scholar
18Coey, J.M.D., Phys. Rev. Lett. 27, 1140 (1971).CrossRefGoogle Scholar
19Néel, L., J. Phys. Soc. Jpn. 17, Suppl. Bl, 646 (1962).Google Scholar