Synthesis and Magnetic Properties of Na-La-Co System M-type Ferrite

In this study, we investigated the synthesis of Na-La system M-type ferrite with different mole ratios. Some part of Fe in the M-type ferrite was substituted by Co, and variation of fraction of the M-type ferrite as function of mole ratio was investigated. Sample with/without Co-substitution composed of multiphases of M-type ferrite and other phases. Fraction of M-type ferrite in the samples was depending on mole ratio in the raw material. Curie temperatures of Co-free and Co-substituted M-type ferrite were approximately 432℃ and 428 ℃, respectively. Saturation magnetisation of the Co-free NaSUB0.5/SUBLaSUB0.5/SUB system M-type ferrite was approximately 72.5 emu/g.