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- W2605174595 abstract "The coexistence of three valence states of Mn ions, namely, +2, +3, and +4, in substituted magnetoplumbite-type BaFe12–xMnxO19 was observed by soft X-ray absorption spectroscopy at the Mn-L2,3 edge. We infer that the occurrence of multiple valence states of Mn situated in the pristine purely iron(III) compound BaFe12O19 is made possible by the fact that the charge disproportionation of Mn3+ into Mn2+ and Mn4+ requires less energy than that of Fe3+ into Fe2+ and Fe4+, related to the smaller effective Coulomb interaction of Mn3+ (d4) compared to Fe3+ (d5). The different chemical environments determine the location of the differently charged ions: with Mn3+ occupying positions with (distorted) octahedral local symmetry, Mn4+ ions prefer octahedrally coordinated sites in order to optimize their covalent bonding. Larger and more ionic bonded Mn2+ ions with a spherical charge distribution accumulate at tetrahedrally coordinated sites. Simulations of the experimental Mn-L2,3 XAS spectra of two different samples with x = 1.5 and x = 1.7 led to Mn2+:Mn3+:Mn4+ atomic ratios of 0.16:0.51:0.33 and 0.19:0.57:0.24." @default.
- W2605174595 created "2017-04-14" @default.
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- W2605174595 date "2017-03-14" @default.
- W2605174595 modified "2023-10-01" @default.
- W2605174595 title "Three Oxidation States of Manganese in the Barium Hexaferrite BaFe<sub>12–<i>x</i></sub>Mn<sub><i>x</i></sub>O<sub>19</sub>" @default.
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- W2605174595 doi "https://doi.org/10.1021/acs.inorgchem.6b02688" @default.
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