کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10998135 | 1392935 | 2019 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
TL in green tourmaline: Study of the centers responsible for the TL emission by EPR analysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 310â¯Â°C. The EPR spectrum of the green tourmaline sample pre-heated to 500â¯Â°C presented a large signal around gâ¯=â¯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 gâ¯=â¯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 310â¯Â°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 170â¯Â°C of the green tourmaline. An optical absorption measurement also was carried out. Bands at around 430, 730 and 1100â¯nm have been observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 205, January 2019, Pages 324-328
Journal: Journal of Luminescence - Volume 205, January 2019, Pages 324-328
نویسندگان
Nilo F. Cano, T.K. Gundu Rao, Jorge S. Ayala-Arenas, Carlos D. Gonzales-Lorenzo, LetÃcia M. Oliveira, Shigueo Watanabe,