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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 1390∘C followed by a rapid quenching is necessary for all preparation methods, since without quenching it is not possible to preserve the La-hexaferrite phase...
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