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- W2737480377 abstract "The saturation magnetization σs and uniaxial anisotropy constants K1 and K2 are measured on a polycrystalline, crystal-oriented sample of LaFe12O19 contaminated with known amounts of Fe3O4 and LaFeO3. K1 and K2 increase strongly with decreasing temperature and the value of K1 = (19–24) × 105 erg/g at T = 0 shows that the substance is considerably more anisotropic than BaFe12O19 (K1 ≏ 8·5 × 105 erg/g) at low temperatures. The σs-T curve is more convex than that of BaFe12O19, so that σs is 11 per cent higher at room temperature but lower at T = 0. The value σs(T = 0) = 96·2 G cm3/g (19·2 μB/molecule) and the anisotropic behaviour are attributed to the presence of 1 Fe2+/molecule occupying the octahedral 2a sites in the magnetoplumbite lattice and having a uniaxial anisotropy of 10–15 cm−1/ion. From measurements on polycrystalline, crystal-oriented samples of BaFe10·8Fe2+0·6Ti4+0·6O19 and BaFe10·5Fe2+1·0Sb5+0·5O19 it was found that, in comparison with LaFe11Fe2+O19, σs (T = 0) is smaller and K1 is much smaller and much less temperature-dependent. The difference in anisotropic behaviour is attributed to a different distribution of the Fe2+ ions among the lattice sites due to the effective positive charge of the Ti4+ and Sb5+ ions." @default.
- W2737480377 created "2017-07-31" @default.
- W2737480377 creator A5040291878 @default.
- W2737480377 date "1974-01-01" @default.
- W2737480377 modified "2023-09-26" @default.
- W2737480377 title "Magnetic anisotropy and saturation of LaFe12O19 and some related compounds" @default.
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- W2737480377 doi "https://doi.org/10.1016/s0022-3697(74)80176-9" @default.
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