Analysis Physical and Crystal Structure of BaFe12-4xAl4xO19 at x=0.007 Prepared by Powder Metallurgy Method

Barium hexaferrite BaFe12O19 doped by alumina Al2O3 have been made by using formula BaFe12-4xAl4xO19 with x = 0.7 % mole through powder metallurgy method. The purpose of this study was to determine the effect of sintering temperature on physical properties and crystal structure of BaFe12-4xAl4xO19. The raw materials such as: BaCO3, Fe2O3 and Al2O3 were mixed according to the composition then calcined at 1050°C for 1 hour. The calcined powder was mixed with 3% wt. of Celuna as a binder, then compacted with 8 tons force. Further the pellets were sintered at a temperature of 1150°C, 1200°C and 1250°C with holding time 1 hour. The characterization includes: density test, porosity test, VSM and XRD analysis. The results show that the highest density was obtained about 4.79g/cm3 at sample which sintered at 1250°C and achieved the smallest porosity about 3.44% at sample which sintered at 1250°C. The XRD results show that the phase consists of BaFe12O19 as dominant Phase while Fe2O3 and Al2O3 a minor phase. . From the results of the Vibrating Sample Magnetometer test a graph of the hysteresis curve of the three pellets in temperature variation is found on the pellet with a temperature of 1150 °C produced soft magnetic material, while for the temperature of 1200 °C is hard magnetic material and at a temperature of 1250 °C a soft magnetic material is produced.