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- W2221337368 abstract "A series of layered double hydroxides with the hydrotalcite structure containing Mg2+ and Al3+ cations in the brucite-like layers and carbonate in the interlayer have been prepared, with different lanthanide cations (4% loading) in the brucite-like layers. The solids have been characterized by element chemical analysis, powder X-ray diffraction, thermal analysis, particle size distribution, FT-IR and UV–Vis spectroscopies and surface texture by adsorption–desorption of nitrogen at – 196 °C. The color and luminescent properties have been also studied. The results confirmed the hydrotalcite-type structure, without any sort of contaminating phases. The solids have been calcined at 1000 °C forming homogeneously dispersed mixed oxides, where the rock-salt structure of MgO and the MgAl2O4 spinel have been identified by powder X-ray diffraction, without any differentiated phase containing lanthanide ions. The samples (original and calcined) containing Tb3+ exhibited green fluorescence, detected under irradiation of 254 and 365 nm. The emission spectra showed a series of narrow lines ascribed to the Tb3+ 5D4→7F6−2 transitions. The decay curves monitored at 543 nm indicated the presence of a single local Tb3+ environment in the parent and calcined samples. For the calcined samples, the photoluminescence evidence supports the insertion of Tb3+ in MgAl2O4 rather than in MgO." @default.
- W2221337368 created "2016-06-24" @default.
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- W2221337368 date "2016-05-01" @default.
- W2221337368 modified "2023-10-03" @default.
- W2221337368 title "Luminescence properties of lanthanide-containing layered double hydroxides" @default.
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- W2221337368 doi "https://doi.org/10.1016/j.micromeso.2015.12.036" @default.
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