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- W2135959093 abstract "The phosphor SrAl12O19:Eu with Eu concentrations from 5% to 100% has been investigated using 151Eu Mössbauer spectroscopy and luminescence measurements. The presence of Eu2+ as well as Eu3+ ions is shown by both techniques. The isomer shift belonging to the Eu2+ as well as the Eu3+ ions slightly increases with increasing Eu concentration, indicating enlarged covalency. The Mössbauer line width of the Eu2+ signal decreases with increasing Eu concentration, which is explained by spin-spin relaxation. The line width of the Eu3+ signal shows a maximum at 25% Eu, which is ascribed to non-equivalent environments due to non-stoichiometry of SrAl12O19. At 25% Eu, the emission spectrum shows an additional band as a consequence of the presence of very small traces of a second phase, and not because of the existence of β-alumina type layers in the magnetoplumbite phase, as suggested in the literature." @default.
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- W2135959093 date "1989-02-01" @default.
- W2135959093 modified "2023-10-16" @default.
- W2135959093 title "151Eu Mössbauer spectroscopic study of the phosphor SrAl12O19:Eu with the magnetoplumbite structure" @default.
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- W2135959093 doi "https://doi.org/10.1016/0025-5408(89)90132-3" @default.
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