Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1522215 | Materials Chemistry and Physics | 2014 | 9 Pages |
Abstract
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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
M. MÄ
czka, A. Bednarkiewicz, E. Mendoza-Mendoza, A.F. Fuentes, L. KÄpiÅski,