کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5402467 | 1392734 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Radioluminescence properties of rare earths doped SrAl2O4 nanopowders
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanopowders of SrAl2O4 pure and doped with rare earths were prepared via a proteic sol-gel methodology. The prepared materials presented a single crystalline phase, confirmed by XRD measurements. AFM results indicate that the average particle size is about 53Â nm for SrAl2O4 powders. The radioluminescence spectrum of SrAl2O4: Eu2+, Dy3+ is composed by two intense peaks around 520 and 570Â nm followed by a weaker emission peaking at 615Â nm. It was observed that the intensity of RL emission during irradiation with X-rays decreased as a function of the irradiation time, indicating the build up of radiation damage in the nanopowders. The irradiated samples exhibited a persistent radiation damage that changes the colour of the sample, and also influenced the reduction in the scintillation efficiency. The saturation level of SrAl2O4: Eu2+ is 96%, exhibiting good resistance to radiation damage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 130, Issue 8, August 2010, Pages 1525-1530
Journal: Journal of Luminescence - Volume 130, Issue 8, August 2010, Pages 1525-1530
نویسندگان
Paulo J.R. Montes, Mário E.G. Valerio,