TL in green tourmaline
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Journal of Luminescence
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Electron paramagnetic resonance (EPR) studies have been carried out to identify the defect centers responsible
for the thermoluminescence (TL) peaks in the mineral tourmaline. The mineral exhibits three TL peaks approximately
at 170, 250 and 310 °C. The EPR spectrum of the green tourmaline sample pre-heated to 500 °C
presented a large signal around g=4.3 due to Fe3+ ion. Room temperature EPR spectrum of irradiated green
tourmaline shows the formation of two defect centers in the region of g=2.0. One of the centers (center II) with
a g factor equal to 1.96 is identified as an F+-center and is related to the observed high temperature 250 and
310 °C TL peaks. Center I exhibiting a doublet is due to hydrogen atoms (H0), stable in the crystal lattice at room
temperature and this center correlates with the TL peak at 170 °C of the green tourmaline. An optical absorption
measurement also was carried out. Bands at around 430, 730 and 1100 nm have been observed.
Como referenciar
CANO, NILO F.; RAO, T.K.G.; AYALA-ARENAS, JORGE S.; GONZALES-LORENZO, CARLOS D.; OLIVEIRA, LETICIA M.; WATANABE, SHIGUEO. TL in green tourmaline: study of the centers responsible for the TL emission by EPR analysis. Journal of Luminescence, v. 205, p. 324-328, 2019. DOI: 10.1016/j.jlumin.2018.09.034. Disponível em: http://repositorio.ipen.br/handle/123456789/30043. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.