Abstract
The effects of the base composition and dopants on the saturation magnetization and coercivity of hexaferrites BaAl x Fe12–x O19, SrAl x Fe12–x O19, BaGa x Fe12–x O19, SrGa x Fe12–x O19, BaSc x Fe12–x O19 and SrSc x Fe12–x O19 have been studied. Isomorphic substitutions of Al2O3, Ga2O3, and Sc2O3 for Fe2O3 in barium and strontium ferrites are found to increase coercivity due to increasing crystallographic anisotropy constant and to reduce the saturation magnetization value. Processes controlling microstructure formation, specifically recrystallization processes, are shown to have a noticeable effect on the level of properties of the ferrites under study with the use of dopants. The most efficient dopants are boron, calcium, and silicon oxides, which provide the formation of relatively fine-grained structures. The increased coercivity upon doping with these dopants is also due to the formation of grain-boundary interlayers of a nonmagnetic glassy phase and the associated efficient retardation of moving domain walls.
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Original Russian Text © V.G. Kostishin, V.G. Andreev, D.N. Chitanov, A.G. Nalogin, N.D. Ursulyak, A.A. Alekseev, A.V. Timofeev, A.Yu. Adamtsev, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 3, pp. 294-299.
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Kostishin, V.G., Andreev, V.G., Chitanov, D.N. et al. Effects of base composition and dopants on the properties of hexagonal ferrites. Russ. J. Inorg. Chem. 61, 279–283 (2016). https://doi.org/10.1134/S0036023616030116
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DOI: https://doi.org/10.1134/S0036023616030116