Aggregation of the dopant ions in NaCl:Eu²⁺ crystals

Kinetics of the Precipitation of Mn2+–Cation Vacancy Dipoles in Doubly Doped KCI: Me2+, Mn2+ (Me = Eu2+, Mg2+, Ba2+) Crystals

“…Pertinent decay curves at the first stage of aggregation have been described by a second-or third-order kinetic equation [12 to 141, while the stage of foreign phase precipitation has mostly been described by a simple exponential relation (Avrami-type) [7, 151. In spite of rather rich research work the relevant mechanisms are not fully explained so far.According to various literature data [5,6, 16 to 191, the aggregation products of Me2+ dopants (Me2+-cation vacancy dipoles) formed at temperatures between 470 and 570 K in KCl crystals are mostly composed of foreign phase precipitates. In the present work we have performed in situ measurements of the precipitation kinetics of foreign phases composed of non-luminescent Me2+ dopant (Mg", Ba2+) and luminescent Mn2+ marker, as well as of two luminescent dopants (EuZ+ and MnZ+) in KCI crystals annealed at 523 K.…”

“…According to various literature data [5,6, 16 to 191, the aggregation products of Me2+ dopants (Me2+-cation vacancy dipoles) formed at temperatures between 470 and 570 K in KCl crystals are mostly composed of foreign phase precipitates. In the present work we have performed in situ measurements of the precipitation kinetics of foreign phases composed of non-luminescent Me2+ dopant (Mg", Ba2+) and luminescent Mn2+ marker, as well as of two luminescent dopants (EuZ+ and MnZ+) in KCI crystals annealed at 523 K.…”