Publications in Scientific Journals:
V. Coral-Flores, M. Küpferling, D. Bueno-Baqués, J. Matutes-Aquino, R. Grössinger:
"Preparation of LaFe12ONO19 by coprecipitation method to reduce the sintering time";
International Journal of Materials and Product Technology,
27
(2006),
1/2;
124
- 129.
English abstract:
Preparation of LaFe12ONO19 by coprecipitation method to reduce the sintering time
Author: V. Corral-Flores, M. Kupferling, D. Bueno-Baques, J.A. Matutes-Aquino, R. Grossinger
Address: Centro de Investigacion en Materiales Avanzados, SC, Magnetic Materials Department, Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109 Chihuahua, Mexico. ' Technische Universitat Wien, Institut fur Festkorperphysik, Wiedner Hauptstrasse 8 10, A 1040 Vienna, Austria. ' Centro de Investigacion en Materiales Avanzados, SC, Magnetic Materials Department, Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109 Chihuahua, Mexico. ' Centro de Investigacion en Materiales Avanzados, SC, Magnetic Materials Department, Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109 Chihuahua, Mexico. ' Technische Universitat Wien, Institut fur Festkorperphysik, Wiedner Hauptstrasse 8 10, A 1040 Vienna, Austria
Journal: International Journal of Materials and Product Technology 2006 - Vol. 27, No.1/2 pp. 124 - 129
Abstract:
LaFe12ONO19 was synthesised by the coprecipitation method. The preparation involved the precipitation of the metal ions from a nitrate solution in the presence of ammonium hydroxide, followed by a digestion step at 80°C. The La:Fe ratio was fixed at 1:8 in order to compensate La losses. The precipitated powder was carefully washed, filtered and dried prior to its oxidation at 800°C for 24 hours. Pressed samples were annealed at several temperatures and times, and rapidly quenched to preserve the LaFe12ONO19 phase. The study of the annealing temperature revealed a shift of the stability range to lower temperatures. 1375°C was fixed to find the influence of the sintering time over the La hexaferrite formation. The sintering time required to obtain La hexaferrite was found to be as short as 5 minutes, which is significantly lower than the one reported before (24-29 hours); however, the highest saturation magnetisation was obtained at 8 hours.
Keywords: coprecipitation method; hexaferrite; magnetoplumbite; sintering; quenching; annealing temperature; saturation magnetisation.
Keywords:
coprecipitation method; hexaferrite; magnetoplumbite; sintering; quenching; annealing temperature; saturation magnetisation
Online library catalogue of the TU Vienna:
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588169
Electronic version of the publication:
http://dx.doi.org/10.1504/IJMPT.2006.010679
Created from the Publication Database of the Vienna University of Technology.