In Situ Formation of Hexaferrite Magnets within a 3Y-TZP Matrix: La2O3–ZnO–Fe2O3 and BaO–Fe2O3 Systems |
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Authors: | Yoshikazu Suzuki Héctor A Calderón Naoki Kondo Tatsuki Ohji |
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Affiliation: | National Industrial Research Institute of Nagoya (NIRIN), Nagoya 462–8510, Japan;Instituto Politécnico Nacional, Distrito Federal 07338, Mexico |
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Abstract: | The in situ formation of magnetoplumbite-type (M-type) hexaferrites within a 3Y-TZP matrix was examined for the La2O3–ZnO–Fe2O3 and BaO–Fe2O3 systems. The formation of barium hexaferrite (Ba-M) was rapid enough at a temperature of 1300°C for 2 h to result in a uniform dispersion of fine Ba-M particles in a tetragonal zirconia polycrystal (TZP) matrix. However, the formation of lanthanum-substituted hexaferrite (La-M) was rather sluggish, despite the existence of a charge-compensating divalent oxide. The 3Y-TZP/20-wt%-BaFe12O19 in situ composite possessed good magnetic properties, as well as moderately good mechanical properties. |
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Keywords: | ferrites zirconia: yttria-stabilized tetragonal polycrystals X-ray methods |
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