کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1522215 | 995307 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low-temperature synthesis, phonon and luminescence properties of Eu doped Y3Al5O12 (YAG) nanopowders
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This contribution presents two simple and cost-effective routes for the low-temperature and large-scale production of pure and Eu-doped Y3Al5O12 (yttrium aluminum garnet YAG) nanopowders. The proposed methodologies combine a mechanically assisted metathesis reaction or coprecipitation from solution followed by crystallization of the obtained precursors from molten sodium nitrate/nitrite. Both procedures allow obtaining pure and/or doped YAG nanopowders at remarkably low temperatures, i.e. already at 350 °C although firing at 500 °C is needed in order to get single phase and fully crystalline materials. As-obtained samples were characterized by XRD, TEM, Raman, IR and luminescence methods. These methods showed that the mean crystallite size is near 23-31 and 51 nm, when crystallization is performed from the amorphous precursor obtained by a mechanically assisted metathesis reaction and coprecipitation, respectively. Raman and IR spectra indicated better crystallinity of the powders prepared at 500 °C. The emission study showed that the intensity ratio between hypersensitive 5D0 â 7F2 and magnetic-dipole 5D0 â 7F1 transitions of Eu3+ is significantly larger than expected for well-crystallized YAG. Origin of this behavior is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 143, Issue 3, 14 February 2014, Pages 1039-1047
Journal: Materials Chemistry and Physics - Volume 143, Issue 3, 14 February 2014, Pages 1039-1047
نویسندگان
M. MÄ
czka, A. Bednarkiewicz, E. Mendoza-Mendoza, A.F. Fuentes, L. KÄpiÅski,