On the spectrally resolved thermoluminescence of alumina

A study of lattice defects in solids belonging to Al2O3−B2O3 and Al2O3−SiO2 systems by thermoluminescence experiments

“…The present results are to be compared with those of previous studies on the TL emission of a and y-aluminas devoid of B203 [2,3]. Even though phase a is found in general only above 1100 ~ samples prepared from aluminum nitrate using hydrazine as a special reducing agent yielded phase a already at 500 ~ The TL pattern of these samples, as recorded by means of the present apparatus, is practically coincident with the one shown in fig.…”

“…The discussion carried out in ref. [2] indicated lonely O ~-interstitials as the defect responsible for these centres. This conclusion applies well also to the present experiments, owing to the high density of lacunar oxygen sites existing in the boro-mullite lattice.…”

“…Previous experiments on the TL emission of a and ~, alumina [2,3] evidentiated the role of interstitial A13+ ions lying in lacunar lattice sites. We report here on experiments with solids belonging to A1203-B20a and Ale08-Si02 systems, in which lacunar sites are present both for trivalent cations and oxygen ions.…”

A study of KCL lattice defects by thermoluminescence experiments

“…This fact, which explains the variability observed in the TL emission features, is probably a general property of lattice defects, because, when studying other ionic crystal, i.e. A120s and Ca F12, the same situation was met with [4][5][6].…”

“…Figures 9 and 10 clearly show such an effect. In reality, this represents a sharp difference as regards the TL emission of A12Os and Ca F12 in which precisely the same wavelengths were emitted at increasing temperatures [4,6]. The proposed interpretation assumes the existence of intermediate levels at which electrons are captured before undergoing tunnel recombination with trapped holes.…”