Artículos de revistas
Synthesis, characterization and spectroscopy of the europium doped lanthanum trimetaphosphate
Fecha
1998-07-24Registro en:
Journal of Alloys and Compounds, v. 275-277, p. 86-88.
0925-8388
10.1016/S0925-8388(98)00279-5
WOS:000075617700020
2-s2.0-0032118816
9430703714241591
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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.