کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8039219 | 1518601 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermoluminescence of α-Al2O3:C,Mg annealed at 1200â¯Â°C
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
Stimulated luminescence in α-Al2O3:C,Mg has thus far been studied for samples annealed at temperature no higher than 900â¯Â°C as can be seen by an examination of the literature. We report the thermoluminescence (TL) features of α-Al2O3:C,Mg annealed at 1200â¯Â°C. A glow curve measured at 1â¯Â°C/s from the samples annealed at 1200â¯Â°C shows eight peaks at 54, 80, 102, 173, 238, 290, 330 and 387â¯Â°C. Kinetic analyses show that the peak at 54â¯Â°C follows general order kinetics (bâ¯=â¯1.3) whereas the rest follow first order kinetics. The values of the activation energy of the peaks are between 0.77â¯eV and 1.90â¯eV and the frequency factors are of the order of 1010-1014â¯sâ1. The intensity of the peaks at 54, 80, 102 and 173â¯Â°C increase with heating rate whereas those of the peaks at 238 and 290â¯Â°C decrease with heating rate. The decrease of intensity of the peaks at 238 and 290â¯Â°C with heating rate is due to thermal quenching whereas the increase of intensity of the peaks with heating rate indicates an inverse thermal-quenching-like behaviour. Interestingly this behaviour is observed only after annealing at 1200â¯Â°C. The activation energy for thermal quenching as calculated using the peaks at 238 and 290â¯Â°C are (1.02â¯Â±â¯0.16)â¯eV and (1.33â¯Â±â¯0.15)â¯eV respectively. Regarding the dosimetric features, the dose response of the peaks at 54, 80 and 102â¯Â°C are sublinear within 1-10â¯Gy and the peak at 54â¯Â°C saturates above 6â¯Gy. In contrast, the response of the peak at 173â¯Â°C is sublinear with 1-4â¯Gy and superlinear between 4 and 10â¯Gy. The peaks are found to fade at different rates and the rate of fading is also affected by annealing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 422, 1 May 2018, Pages 78-84
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 422, 1 May 2018, Pages 78-84
نویسندگان
J.M. Kalita, M.L. Chithambo,