Influence of Al or Cr substitution on structure and magnetic properties of barium hexaferrites prepared by hydrothermal method
Mironovich A.Y. Kostishin V.G. Al-Khafaji H.I. Savchenko E.S. Ril A.I. Shakirzyanov R.I. Sysoev M.A.
1 May 2025Elsevier B.V.
Journal of Magnetism and Magnetic Materials
2025#619
In this study, BaFe12-xCrxO19 and BaFe12-xAlxO19 (x = 0.0, 0.1, 0.3 and 0.4) powders were prepared by a hydrothermal method followed by annealing. The incorporation of Cr and Al in the hexaferrite structure was confirmed by elemental analysis and the results of Rietveld refinement of X-ray diffraction patterns, which revealed a decrease in the lattice volume with increasing x. Based on Mössbauer spectroscopy and magnetic measurements, the lack of Fe3+ was observed in the 12k site for BaFe12-xAlxO19 samples and in the 12k, 4f1 and 4f2 sites for BaFe12-xCrxO19 samples. With increasing substitution, the magnetic parameters of Al-substituted hexaferrites varied slightly, possibly due to limited incorporation of Al3+. At the same time, a significant decrease in Hc was observed for Cr-substituted samples (5629 Oe for x = 0 and 2092 Oe for x = 0.4). Electron microscopy revealed that the substitution of Fe3+ with Al3+ had no significant effect on crystallite morphology. The substitution of Fe3+ with Cr3+ leads to the thinning and widening of the plate-like grains of hexaferrite. This could be one of the reasons for the decrease in coercivity.
Barium hexaferrite , Coercivity , Hydrothermal synthesis , Magnetic measurements , Mössbauer spectroscopy
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National University of Science and Technology “MISIS”, Leninsky Prospekt, 4, Moscow, 119049, Russian Federation
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences (IGIC RAS), Leninsky Prospekt, 31, Moscow, 119991, Russian Federation
Engineering Profile Laboratory, L.N. Gumilyov, Eurasian National University, Astana, 010008, Kazakhstan
National University of Science and Technology “MISIS”
Kurnakov Institute of General and Inorganic Chemistry
Engineering Profile Laboratory
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