In this study, BaGdxAlxCrxFe(12-3x)O19 (x = 0.0, 0.2, 0.4, 0.6, 0.8) hexagonal ferrites were synthesized by sol-gel combustion methods. The samples' X-ray diffraction pattern shows a hexagonal phase that was identified using JCPDS data (00-033-1340) and had hexagonal crystal symmetry in space group P63/MMC. On the FTIR spectrum of BaGdxAlxCrxFe(12-3x)O19, the bands at 431-605cm-1 correspond to the Fe-O stretching vibrations and prove the formation of nanohexagonal ferrites. Field emission electron microscopy (FESEM) pictures have represented the formation of hexagonal nanoparticles, but by increasing the dopants, which have less magnetic properties than iron (III) ions, the hexagonal structure can be seen well yet. A vibrating sample magnetometer (VSM) shows the Ms value of the barium hexaferrite (BHF) sample at approximately 63.76 emu/g, which is proportional to the predicted value for standard hexaferrites, and Hc at approximately 7000 Oe, confirming the magnetic hardness of the nanocomposite. The hysteresis diagrams show that the values of Ms and Hc decrease with increasing dopants. The degradability of methylene blue (MB) demonstrates that all samples have desirable photocatalytic properties in visible light. The degradability rates in all samples are 65%-99%. The results indicate that the degradability rate increases significantly as the dopant ions increase. پرونده مقاله