Abstract
In the present work, BaFe12-xNixO19 (x = 0, 0.1, 0.3, 0.5) powders were prepared by the hydrothermal method with post annealing. The obtained samples were analyzed by several methods, including XRD, Mossbauer spectroscopy, EDX, VSM, and AFM. Structural and elemental analyses confirm that Ni enters the hexaferrite lattice. Since Ni2+ replaces Fe3+, some charge compensation mechanism must be involved. According to the data obtained, the most probable mechanism is the formation of oxygen vacancies. Based on the results of Mossbauer spectroscopy and magnetic measurements, the cation distribution was established. The Ni2+ ions prefer to occupy the 12k site, which leads to a decrease in the saturation magnetization. All magnetic parameters (saturation magnetization, coercivity, and remanence) correlate negatively with the Ni concentration.
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