Blue thermoluminescence emission of annealed lithium rich aluminosilicates



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Correcher, V. and Rodriguez Lazcano, Y. and García Guinea, J. and Crespo Feo, María Elena (2010) Blue thermoluminescence emission of annealed lithium rich aluminosilicates. Brazilian Journal of Physics, 40 (3). pp. 348-352. ISSN Issn: 0103-9733 ; Essn: 1678-4448

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The blue thermoluminescence (TL) emission of different thermally annealed (i) ß-eucryptite (LiAlSiO4), (ii) virgilite-petalite (LiAlSi5O12) and (iii) virgilite-petalite-bikitaite (LiAlSi10O22) mixed crystals have been studied. The observed changes in the TL glow curves could be linked to simultaneous processes taking place in the lithium aluminosilicate lattice structure (phase transitions, consecutive breaking linking of bonds, alkali self-diffusion, redox reactions, etc). The stability of the TL signal after four months of storage performed at RT under red light, shows big differences between annealed (12 hours at 1200°C) and non-annealed samples. The fading process in non-annealed samples can be fitted to a first-order decay mathematical expression; however preheated samples could not be reasonably fitted due to the highly dispersion detected. The changes observed in the X-ray diffractograms are in the intensity of the peaks that denote modifications in the degree of crystallinity and, in addition, there are some differences in the appeareance of new peaks that could suppose new phases (e.g. ß-spodumene).

Item Type:Article
Uncontrolled Keywords:Aluminosilicates; Phosphors; Thermoluminescence
Subjects:Sciences > Geology > Mineralogy
Sciences > Geology > Petrology
ID Code:76411
Deposited On:30 Jan 2023 06:43
Last Modified:30 Jan 2023 06:43

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