Effect of FeMo additive and calcination process on magnetic powders BaFe₁₂O₁₉

In this study, we have been investigated the effect of FeMo additive and calcination process in magnet permanent barium hexaferrite. The permanent magnet of barium hexaferrite was prepared by mechanical alloying method. The mixing powder of BaFe₁₂O₁₉ and FeMo was calcinated on 1000 and 1200 °C prepared of temperature. The characterization was done for physical and magnetic properties with X-ray Powder Diffraction (XRD) and picnometer for the phase of material and the powder density and then Vibrating Sample Magnetometer (VSM) for the magnetic properties of barium hexaferrite magnet. The experiment result showed analysis that addition of FeMo increased the powder density of barium hexaferrite. The magnetic properties result showed that increasing of FeMo additive make decreasing of magnetic characterization. While the more addition of FeMo can be increases remanence, saturation, and BH_max Even though decreases the coercivity. The increasing of calcination temperature can increases remanence and BH_max but decreases saturation and coercivity. It means the process can changes the magnet structure from hard to soft magnetic material. The optimum value, when the barium hexaferrite add %wt 5 FeMo additive with 3.71 g/cm³ powder density before calcination process. And the magnetic properties such as: saturation 2.12 kG, remanence 1.15 kG, coercivity 0.45 kOe dan BH_max 0.145 MGOe after calcination process at 1000 °C. (author)