The magnetic properties of Ba-, Sr- and Pb- ferrites with and without Bi
2O
3 were observed. Fe
2O
3 prepared from Fe(CO)
5, BaCO
3, SrCO
3, PbO and Bi
2O
3 were fired at 900° for 2 hours, and then sintered at 1000∼1200° for 15 minutes. The results obtained were as follows: (1) 4π
Is and 4π
Ir of Ba-ferrtes with 1.5%Bi
2O
3 were larger than those of Ba-ferrites without Bi
2O
3 by 20∼30% under the above sintering conditions. (2)
IHC of Ba-ferrites containing Bi
2O
3 was larger than that of single Ba-ferrites by 15∼40% at the composition of Fe
2O
3/BaO<6.0. (3) Such effects of Bi
2O
3 could scarcely be recognized in Sr- and Pb-ferrites. (4) The above effects of Bi
2O
3 might be due to the acceleration of the sintering velocity.
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