Preparation and magnetic properties of Zn-Ti subtituted Ba-ferrite powders

摘要

Zn-Ti-substituted barium ferrite powders were prepared by the sol-gel method and characterized. The room temperature magnetic properties were evaluated for different levels of dopant, Fe/Ba ratios, and heat-treatment temperatures. The results showed that M_s was not very much influenced by the substitution level up to 0.6 at.%. Contrarily, H_ci did show a marked decrease, owing to the reduction of the magnetocrystalline anisotropy of the BaM phase. On the other hand, an excess of Ba led to the decrease of M_s and the increase of H_ci. Additionally, Zn-Ti substitutions were effective in decreasing crystallite sizes below 100 nm.