کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10998149 | 1392935 | 2019 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermally and optically stimulated luminescence of natural red and blue corundum (Al2O3)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
We report the thermoluminescence (TL) and optically stimulated luminescence (OSL) of natural corundum (Al2O3) of two varieties; one red and the other blue. X-ray fluorescence spectroscopy of the samples show that the concentration of Al2O3 in the red corundum is 43.05% and 46.87% in the blue corundum. TL measurements carried out on un-annealed samples and samples annealed at 700â¯Â°C, 900â¯Â°C and 1200â¯Â°C show that the TL sensitivity increases with annealing. The sensitivity of the red corundum reaches a maximum after annealing at 900â¯Â°C whereas that of the blue corundum increases with annealing up to the maximum annealing temperature of 1200â¯Â°C used in this study. Both samples have a complex glow curve between 30â¯Â°C and 500â¯Â°C. The composite nature of the glow curves is deduced to be due to a continuum in the trap distribution in the crystal. The activation energy of the traps vary between 0.70â¯eV and 1.15â¯eV. The dose response of the red corundum under TL is linear within 100â1000â¯Gy whereas that of the blue corundum is superlinear for the same dose range. The TL of both samples is reproducible but the signal fades with time between irradiation and measurement. Both samples produce OSL under 470â¯nm blue light stimulation. The dose response of the OSL is superlinear within 100â1000â¯Gy. It is found that the samples also produce thermally-assisted OSL (TA-OSL) at elevated temperature. The TA-OSL intensity of the red corundum increases with dose up to 400â¯Gy and saturates thereafter. On the other hand, the intensity of the blue corundum increases consistently with dose from 100â¯Gy to 1000â¯Gy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 205, January 2019, Pages 417-422
Journal: Journal of Luminescence - Volume 205, January 2019, Pages 417-422
نویسندگان
J.M. Kalita, Sunil Thomas, M.L. Chithambo,