STRUCTURAL AND MAGNETIC-PROPERTIES OF BARIUM HEXAFERRITE NANOSTRUCTURED PARTICLES PREPARED BY THE COMBUSTION METHOD

The combustion method, a fast and simple way of preparing sub-micromet er sized particles from a solution of the corresponding metal nitrates and a reducing agent (ODH, TFTA) which is used as a fuel, was adapted to the synthesis of barium hexaferrite particles. Structural and magn etic properties were investigated by X-ray diffraction, transmission e lectronic microscopy, magnetic measurements and Mossbauer spectrometry on nanostructured as well as on microstructured particles resulting f rom annealing treatments under different conditions. High values of th e coercive field (5.3 kOe) and of the magnetization (57.8 emu/g), at 1 3.5 kOe, were obtained on well crystallized BaFe12O19 particles anneal ed at 850 degrees C.