LAUSR

Abstract The synthesis of BaFe12-2xMgxAlxO19 has been successfully carried out with x = (0-0.5) mol% in co-precipitation with a calcination temperature of 1050°C using the precursors BaCl2, MgCl2, Al2Cl3 and natural iron sand from Kata Beach, Sumatera Barat-Indonesia. The characterization that was carried out included, XRD, FE-SEM, VSM, and VNA. The effect of adding Mg-Al to the barium hexaferrite microstructure resulted in no observable changes to the crystalline structure, thereby decreasing magnetic properties and decreasing the yield of microwave absorption. The results of the study obtained was a BaFe12O19 single phase with particle sizes ranging between 28.1 nm - 44.2 nm. The optimum condition was obtained x = 0.1 mol% with a crystal diameter of 44.2 nm, magnetic saturation of 44.75 emu g-1 and a magnetic coercivity of 2358 Oe. The maximum reflection loss value is obtained at -63.85 dB at a frequency of 10.90 GHz and microwave absorption is 99.99%.