Dependence uf Magnetic Properties of Barium Ferriteun Additives and Microstructure

In this work the effect of nonmagnetic oxide additives on microstructure and magnetic propperties or barium ferrite is studied. Two groups of samples were prepared, one with limonite and the other with hematite, both huving similar barium carbonate. The conventional wet ceramic tcdlnitjuc was used for the preparalion of the samples and the percentage o f different impurities in the raw materils was determined by XRF and atomic absorption Ler..:hniques. The magnetic results ob tained for the first group arc suppcrior und their grian sizes arc smaller us compared to the second group. By adjusting only two or the additives (Al z0 3 and Si0 2) in the second group the magnetic parameters were improved and the grain sizes were reduced. The inhibiting effect of Si02 on grain growth mcr..:hanism during sintering is also discussed.