%0 Journal Article %1 WOS:000221561000019 %A Souza, DN %A de Lima, JF %A Valerio, MEG %A Sasaki, JM %A Caldas, LVE %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2004 %I ELSEVIER SCIENCE BV %J NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS %K EPR} TL; X-ray diffraction; powder {topaz; %P 123-127 %R 10.1016/j.nimb.2003.12.050 %T Radiation-induced charge trapping and recombination process in natural topaz studied by TL, EPR and XRD %V 218 %X Thermoluminescence (TL) was combined with X-ray diffractometry and electron paramagnetic resonance (EPR) to identify charge traps and recombination centres in natural topaz and to help the understanding of the process of light emission in this solid. According to the results, colourless samples presented higher TL intensities than coloured samples, and they also exhibited the highest OH/F occupation factors. The thermal treatments were found to change the OH/F ratios since samples treated at about 400 degreesC present higher TL response and occupation factors. These results indicate that the OH(-) group is directly connected to the trapping centres in topaz. The EPR signal with g approximate to 2.02, due to (AlO(4))(0) centres, increases with the dose. From the TL and the EPR results, it was possible to confirm that the (AlO(4))(0) centre is the luminescent centre in topaz. (C) 2003 Elsevier B.V. All rights reserved.

@article{WOS:000221561000019, abstract = {Thermoluminescence (TL) was combined with X-ray diffractometry and electron paramagnetic resonance (EPR) to identify charge traps and recombination centres in natural topaz and to help the understanding of the process of light emission in this solid. According to the results, colourless samples presented higher TL intensities than coloured samples, and they also exhibited the highest [OH]/[F] occupation factors. The thermal treatments were found to change the [OH]/[F] ratios since samples treated at about 400 degreesC present higher TL response and occupation factors. These results indicate that the OH(-) group is directly connected to the trapping centres in topaz. The EPR signal with g approximate to 2.02, due to (AlO(4))(0) centres, increases with the dose. From the TL and the EPR results, it was possible to confirm that the (AlO(4))(0) centre is the luminescent centre in topaz. (C) 2003 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Souza, DN and de Lima, JF and Valerio, MEG and Sasaki, JM and Caldas, LVE}, biburl = {https://www.bibsonomy.org/bibtex/2a581ef9928e9677979799691eac71c6c/ppgfis_ufc_br}, doi = {10.1016/j.nimb.2003.12.050}, interhash = {f88d09677e77b095dda04d32039e788d}, intrahash = {a581ef9928e9677979799691eac71c6c}, issn = {0168-583X}, journal = {NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}, keywords = {EPR} TL; X-ray diffraction; powder {topaz;}, note = {12th International Conference on Radiation Effects in Insulators, Gramado, BRAZIL, AUG 31-SEP 05, 2003}, organization = {UFRGS; FAPERGS; CNPQ; FINEP; Elsevier; High Voltage Engn Europa BV}, pages = {123-127}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Radiation-induced charge trapping and recombination process in natural topaz studied by TL, EPR and XRD}, tppubtype = {article}, volume = 218, year = 2004 }