Effect of temperature sintering on characterization of BaFe12-4xAl4xO19 on x = 0.001 prepared by powder metallurgy method

The synthesis of BaFe12-4xAl4xO19 with x = 0.001 was done by using the powder metallurgy method with the raw materials such as : BaO, Fe2O3 and Al2O3. The raw materials were mixed and calcined at 1050 °C with holding time of 1 hour. After calcination, the powder was mixed with 3% wt. of celuna, then compacted with force of 8000 kgf. Then, the pellets were sintered at temperature of 1150 °C, 1200 °C, 1250 °C with holding time of 1 hour. The characterization of sintered samples was conducted such as : measurement of bulk density, porosity, XRD and magnetic properties. lts show that the highest value of bulk density about 4,379 gr/cm3 and lowest porosity about 9.81 % were achieved for samples sintered at 1250°C. While in XRD test result shows that it was found some phases such as BaFe12O19 as dominant phase and Fe2O3 phase as minor phase. The temperature sintering gives a siqnificantly value of bulk density and porosity, whereas the increase in sintering temperature can cause a shift in the peak of BaFe12O19, which in this case refers to the substitution of Fe atoms with Al atoms. Sintering temperature can influence siqnificantly magnetic properties, samples sintered 1150 and 1200°C become hard magnetic and sanple sintered 1250°C becomes soft magnetic.