1989
DOI: 10.1002/pssb.2221520204
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Colour centres in barium hexaaluminate (Phase I). Study by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence

Abstract: Colour centres produced by X-ray irradiation of barium hexaaluminate (phase I) with' p-alumina structure are studied by electron paramagnetic resonance, optical absorption, and thermally stimulated luminescence. It is shown that in addition to the F+ centres characteristic of p-alumina phases, this compound presents other colour centres such as F, 0-, and possibly V-type centres.The stability of these defects is investigated by means of thermal bleaching experiments and thermally stimulated luminescence. An al… Show more

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Cited by 9 publications
(5 citation statements)
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“…It is indeed found that irradiation induces oxygen vacancies and can extract interstitial oxygen in the CL. 43,44 These defects may reach Eu 2+ impurities, induce Eu oxidation and have an impact on the luminescence behavior of remaining Eu 2+ .…”
Section: ■ Discussionmentioning
confidence: 99%
“…It is indeed found that irradiation induces oxygen vacancies and can extract interstitial oxygen in the CL. 43,44 These defects may reach Eu 2+ impurities, induce Eu oxidation and have an impact on the luminescence behavior of remaining Eu 2+ .…”
Section: ■ Discussionmentioning
confidence: 99%
“…Structures crystallizing isotypically to b-alumina, such as BAM, often have a large number of defects. [45][46][47][48] Moreover, at higher temperatures the oxidation of Eu 2+ to Eu 3+ on the surface is observed. [49,50] In the case of BAM, there are no indications for an analogous oxidation caused by radiation, but structural changes in the host lattice are likely.…”
Section: The Blue Color Pointmentioning
confidence: 94%
“…These traps are mainly due to the delocalization of the cationic and anionic ions and therefore the formation of F and V centers. This point is particularly important for BAM where oxygen vacancies can be created in the conduction layer close to dopant ions, (Ba/ Eu-O) layer [27][28][29][30][31].…”
Section: Degradation Mechanismmentioning
confidence: 98%