标题：Effect of calcination temperature on Microstructures, magnetic properties, and microwave absorption on BaFe11.6Mg0.2Al0.2O19 synthesized from natural iron sand
摘要：The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1050, and 1200 °C were conducted through a co-precipitation method to be used as Radar Absorbing Material. The raw materials used in the syntheses were: BaCl2, MgCl2, AlCl3 and natural iron sand from Kata Beach-Sumatera Barat, Indonesia. The material was characterized using XRD, FE-SEM, VSM, and VNA. The results confirmed that the structure of the barium hexaferrite crystal did not change due to the effect of calcination temperature. The optimum conditions properties obtained for BaFe11.6Mg0.2Al0.2O19 at a calcination temperature of 900 °C, Ms = 20.64 emu g−1, Mr = 9.89 emu g−1, Hc = 1708 Oe, and BHmax = 45800 GOe, respectively. In addition, the maximum reflection loss and the microwave absorption values obtained were − 58.60 dB and 99.99% at a frequency of 10.91 GHz.
