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M. Küpferling, V. Corral-Flores, R. Grössinger, J. Matutes-Aquino:
"Preparation and characterization of LaFe₁₂O₁₉ hexaferrite";
Journal of Magnetism and Magnetic Materials, 290-291 (2005), S. 1255 - 1258.

Three different methods (mechanical alloying, coprecipitation and sol-gel) were used for preparing LaFe12O19 hexaferrite and all seem to be suitable for preparation of this phase. A heat treatment in the small temperature range between 1360 and followed by a rapid quenching is necessary for all preparation methods, since without quenching it is not possible to preserve the La-hexaferrite phase. Detailed investigations were performed for the method of coprecipitation varying the La excess, the heat treatment temperature and the quenching method.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938146

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