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Effects of Additionals on the Magnetic Properties of PbO-Fe_2O_3 System

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Effects of additionals on the magnetic properties were observed in PbO-Fe_2O_3-MO system, varying the sintering conditions and the value of Fe_2O_3/PbO. Substituting PbO or Fe_2O_3 for SnO, ZnO, CdO, MgO, NiO, CuO, CoO, Cr_2O_3, B_2O_3, GeO_2, SiO_2 and ZrO_2, etc., it was found that Cr_2O_3, B_2O_3, GeO_2 and SiO_2 are effective. Best results were obtained in these systems mixed at Fe_2O_3/PbO=4?5 by mol and sintered at 950°?1100℃. Magnetic properties of the improved PbO system oxide magnets were comparable to those of the BaO or SrO system.

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