Comportamento de íons fora de centro em halogenetos alcalinos / Behaviour of off-center ions in alkali halides

AUTOR(ES)

Maximo Siu Li

DATA DE PUBLICAÇÃO

1978

RESUMO

Experimental results are given on the off-center behavior of Cu+ ion in RbCl, RbBr, Hbl, NaI and in mixed crystals of KI+%KCl and KCl+%KI, as also on Ag+ in RbI. We use UV optical absorption, ionic thermal current (ITC) and uniaxial stress induced dichroism techniques. It is studied the temperature dependence of the oscillator strength, the relaxation time and the electric dipo1e moment are determined in the above crystals. We observe and discuss the change on the equi1ibrium configuration trigonal of the Cu+ ion in KI to the ortorrhombic in Kl+%KCl mixed crystal. For the first time we detect with the ITC measurements a thermal activated process at low temperature (24ºK), this behaviour occurs in RbI:Ag+. Using mid-infrared absorption measurements, we give several results and discussions on the U centers (either H- or D-) perturbed by Li+ ion in KCl crystals.

ASSUNTO(S)

halogenetos alcalinos alkali halides Íons fora de centro off-center ions

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