Abstract
(Sr⋅Ba)-La-Co M-type ferrite fine particles were prepared by the chemical coprecipitation and subsequent heat-treatment method. The chemical reagents used for the experiment were FeCl3⋅6H2O, BaCl2⋅6H2O, SrCl2.6H2O, LaCl3⋅7H2O, and CoCl2.6H2O. The chemical coprecipitation process was applied to the samples having the formula. {(SrO)1-x⋅(BaO)x⋅n/2(Fe2O3)}100-Y-Z(La2O3)Y(CoO)Z (n=6.0-12.0, x=0.0-1.0, y=1.0-10.0, z=1.0-10.0). The solution containing Sr2+, Ba2+, Fe3+, La3+, and Cot2+ was poured into solution of NaOH (pH=13.0). The precipitated products were boiled for 2h and they were carefully washed with water and dried. The obtained fine particles were heated at 950 to 1100°C for 2h in air to obtain the single phase of (Sr⋅Ba)-La-Co M-type ferrite fine particles. The best magnetic properties were observed for the sample with the composition of {(SrO)0.8⋅(BaO)0.2⋅3.5(Fe2O3)} 88.0 (La2O3)6.0(CoO)6.0, and magnetic properties were as follows: σs= 84.8 × 10-6 Wb⋅m/kg (67.5 emu/g), σr=42.8 × 10-6 Wb⋅m/kg (34.1 emu/g), HcJ=476.6 kA/m (5.98 kOe) and Tc=452.6°C.
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