Article: Preparation of LaFe12ONO19 by coprecipitation method to reduce the sintering time Journal: International Journal of Materials and Product Technology (IJMPT) 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. Inderscience Publishers - linking academia, business and industry through research

Title: Preparation of LaFe₁₂ONO₁₉ by coprecipitation method to reduce the sintering time

Authors: V. Corral-Flores, M. Kupferling, D. Bueno-Baques, J.A. Matutes-Aquino, R. Grossinger

Addresses: 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

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.

DOI: 10.1504/IJMPT.2006.010679

International Journal of Materials and Product Technology, 2006 Vol.27 No.1/2, pp.124 - 129

Published online: 16 Aug 2006 *

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Title: Preparation of LaFe12ONO19 by coprecipitation method to reduce the sintering time

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Title: Preparation of LaFe₁₂ONO₁₉ by coprecipitation method to reduce the sintering time