Resumo

VASQUEZ, S.O.  e  FLINT, Y C.. ESTUDIO DE LOS PROCESOS DE TRANSFERENCIA DE ENERGIA ENTRE IONES Pr³⁺ DOPADOS EN Cs₂NaYCl₆. Bol. Soc. Chil. Quím. [online]. 1999, vol.44, n.4, pp.487-496. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16441999000400013.

Experimental studies are made for some selected electronic transitions in Cs₂NaY_1-xPr_xCl ₆ crystals within the full doping range of the crystal lattice (0 x 1). Decay curves are recorded for various temperatures between 15 K and 298 K. The experimental evidence shows the existence of cross-relaxation processes even at the limit of dilution. In this last case, this type of processes would be the result of local heterogeneity in the distribution of Pr³⁺ ions, as well as due to the presence of defective sites. These results are analyzed in terms of the crystal model, which is applied to electric multipole interactions (dipole-dipole, dipole-quadrupole, and quadrupole-quadrupole)

Palavras-chave : Energy transfer; cross-relaxations; electric multipolar interactions; elpsolites; crystal model.