Composition dependence of glow peak temperature in KCl_1 xBr_xdoped with divalent cations

Abstract

Thermoluminescence measurements of β-irradiated Eu 2+ -and Ca 2+ -doped KCl 1−x KBr x solid solutions excited at room temperature have been carried out to identify the effect of composition on the glow peaks. A typical glow peak has been distinguished for each composition. A linear dependence of its temperature on the composition x has been found. These results indicate that for divalent impurity-doped alkali halide solid solutions these glow peak temperatures are mostly dependent on the lattice constant of the host than on the size of the anion or impurity cation.

Thermoluminiscence Response of an Alloy Quaternary Ionic Crystal Exposed to High Energy Radiation

“…Seeing the sample as a binary KBr 0.5 KCl 0.5 : Eu 2+ the main glow peaks temperature obeys the molar fraction of halogen composition since it is found in the middle between KBr: Eu 2+ and RbCl: Eu 2+ main glow peaks, while the alkali ions has minor influence in that temperature [3,7,8]. TL of four components mixed crystals with several compositions has to be studied to verify the halogen composition dependence of the glow peak temperature.…”

“…The typical TL emission features are mainly four glow peaks located at 362 K, 415 K, 491 K, 576 K, approximately. The peak emission of TL that occurs around 415 K attracts the attention because it corresponds to peak of 0.5 Cl and 0.5 Br composition and that responds well to halide composition effect on the TL glow peak temperature of mixed crystals [3].…”

“…More recently, some reports are available about binary crystalline mixtures irradiated with beta rays [3]. A complete characterization of a thermoluminescent material gives a characteristic glow curves related to stability of their traps.…”

Mixture effects on the glow peak temperature of europium doped binary crystals

“…3 Results and discussion Figure 1 shows a typical glow curve of RbCl:Eu 2+ , which has the shape of the glow curve of KCl:Eu 2+ ; however, the most intense glow peak appears about 180 °C, a lower temperature than the GPT of KCl:Eu 2+ [6]. This behaviour is considered as the influence of the Rb cation size on the recombination mechanism.…”

“…On the other hand, the TL changes in β-irradiated europium doped KCl 1-x Br x mixed crystals [6] with a fixed impurity concentration have been studied as function of the composition x. Each of these materials was characterized by a main glow peak whose temperature has been related to the lattice constant of the mixed crystal through a linear relationship between the GPT and the composition x.…”