Publicação: Synthesis, characterization and spectroscopy of the europium doped lanthanum trimetaphosphate
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Orthorhombic modification of europium doped lanthanum trimetaphosphate has been prepared. The compound was obtained by precipitation of rare earth chloride solution with trimetaphosphoric acid. The characterizations were made using X-ray diffractometry, chemical analysis and infrared spectroscopy. Excitation and emission spectra were recorded at liquid nitrogen and room temperatures. Assignments of the 5D0→7FJ (J=0, 1, 2, 3, 4, 5) transitions were made and an unusual high 5D0→7F4 transition intensity with six split lines has been observed. Structural distortion of the crystal lattice may be caused by the Eu3+ ion inclusion. The simple overlap model was applied for the calculation of the total splitting of the 5D0→7F1 transition, the 5D0→7F0/5D 0→7F2 transition intensity ratio and the Ωλ (λ=2.4) intensity parameters. Theoretical predictions showed to be in good accordance with the experimental data. © 1988 Elsevier Science S.A.
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F-f intensities, Lanthanide trimetaphosphate, Orthorhombic structure, Chemical modification, Chlorine compounds, Crystal lattices, Doping (additives), Electron transitions, Europium, Infrared spectroscopy, Mathematical models, Phosphoric acid, Precipitation (chemical), Synthesis (chemical), X ray crystallography, Lanthanum trimetaphosphate, Simple overlap model, Lanthanum compounds
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Inglês
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Journal of Alloys and Compounds, v. 275-277, p. 86-88.
