| Numéro |
J. Phys. IV France
Volume 07, Numéro C1, Mars 1997
7th INTERNATIONAL CONFERENCE ON FERRITES
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|---|---|---|
| Page(s) | C1-319 - C1-320 | |
| DOI | https://doi.org/10.1051/jp4:19971126 | |
7th INTERNATIONAL CONFERENCE ON FERRITES
J. Phys. IV France 07 (1997) C1-319-C1-320
DOI: 10.1051/jp4:19971126
1 Facultad de Ingenieria, Universidad de Buenos Aires, Paseo Colon 850 Buenos Aires, Argentina
2 Unidad de Actividad Quimica, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires, Argentina
3 INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
© EDP Sciences 1997
J. Phys. IV France 07 (1997) C1-319-C1-320
DOI: 10.1051/jp4:19971126
The Thermal Evolution of a Barium Ferrite Precursor Obtained by a New Chemical Coprecipitation Method
S.E. Jacobo1 and M.A. Blesa2, 31 Facultad de Ingenieria, Universidad de Buenos Aires, Paseo Colon 850 Buenos Aires, Argentina
2 Unidad de Actividad Quimica, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires, Argentina
3 INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Abstract
The evolution during thermal treatment of the precursor obtained by a new method to synthezise barium hexaferrite by chemical coprecipitation is described; the method involves the precipitation froma strongly alkaline ferrate(VI) solution containing barium chloride. Barium hexaferrite may be formed by heating of the original superparamagnetic precursor at temperatures as low as 700°C as shown by XRD, Mössbauer spectra and DTA-TGA behaviour. The precursor does not contain appreciable amounts of carbonate, thus favouring the formation of the hexaferrite at lower temperatures. Scanning electron microscopy shows that the ferrite particles are less than 0.5 µm in diameter.
© EDP Sciences 1997