کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1505797 | 993773 | 2010 | 5 صفحه PDF | دانلود رایگان |
Thermal annealing of Sm+3 or Er+3 doped Na2O/K2O/BaF2/BaO/Al2O3/SiO2 glasses led to the precipitation of nanocrystalline BaF2. The mean crystallite sizes were in the range from 9 to 15 nm as shown by XRD line broadening. Whereas glasses without rare earth oxides showed crystallites homogenously dispersed in the amorphous matrix, those doped with 0.05 mol% ErF3 or SmF3 showed highly agglomerated crystals. The latter was due to droplet phase separation in the rare earth doped glasses as proved by transmission electron microscopy while in the undoped glasses phase separation did not occur. Furthermore, the size of the droplets depended on the BaO-concentration. Fluorescence emission spectra of a samarium doped sample showed higher intensities than in the glasses they were prepared from.
Thermal annealing of Sm+3 or Er+3 doped Na2O/K2O/BaF2/BaO/Al2O3/SiO2 glasses led to the precipitation of nanocrystalline BaF2.Figure optionsDownload as PowerPoint slide
Journal: Solid State Sciences - Volume 12, Issue 12, December 2010, Pages 2086–2090