SciELO - Scientific Electronic Library Online

vol.40 issue3Theoretical studies of the local structure and the EPR parameters for substitutional Mo5+ in TiO2Dielectric and piezoelectric properties of Ba(Zr xTi1-x)O3 lead-free ceramics author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Brazilian Journal of Physics

Print version ISSN 0103-9733


CORRECHER, V.; RODRIGUEZ- LAZCANO, Y.; GARCIA- GUINEA, J.  and  CRESPO- FEO, E.. Blue thermoluminescence emission of annealed lithium rich aluminosilicates. Braz. J. Phys. [online]. 2010, vol.40, n.3, pp.348-352. ISSN 0103-9733.

The blue thermoluminescence (TL) emission of different thermally annealed (i) β-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 1200ºC) 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. β-spodumene).

Keywords : Phosphors; thermoluminescence; aluminosilicates.

        · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License