Effect of sintering temperature variations of barium hexa ferrite on physical properties and crystal structure

Abstract

A Barium hexa ferrite BaFe12O19 permanent magnet has been made by using raw materials barium carbonate BaCO3 and hematite Fe2O3. The raw materials such as BaCO3 and Fe2O3 were mixed according to the composition mole ratio BaO:Fe2O3 = 1:6, then calcined at 1050 C for one hour. The calcined powder was then crushed by using hand mortar and then mixed with WE-518 celuna as muchas 3 % wt. The powder was compacted with 8 tons force to form a pellet. Further the pellets were sintered at a temperature of 1150 C, 1200 C and 1250 C with holding time one hour. The sintered samples were characterized such as: physical properties measurement (density and porosity) and micro structure analysis using XRD and magnetic properties testing measurement by vibration sample magnetometer. The characterization results show that the sample with sintering temperature of 1250 C had the highest density value of 1.43 g/cm3 and the lowest porosity value was 4.16 %. From the XRD results show that the sample that was sintered 1150 C had a single phase BaFe12O19, while the samples that had been sintered 1200 C and 1250 C were obtained in two phases, namely dominant phase is BaFe12O19 and minor phase is Fe2O3. Of the three samples tested by VSM, samples with a sintering temperature of 1150 C have good conditions and magnetic properties greater than both. the sintering temperature affects the value of each category of magnetic properties of the sample.