Wang, Li-Li and Mei, Lin and He, Gang and Liu, Guang-Hua (2012) Preparation of infrared transparent YAG-based glass-ceramics with nano-sized crystallites. sciencedirect, 32 (12). pp. 3091-3096. ISSN 0955-2219
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Official URL: http://www.sciencedirect.com/science/article/pii/S...
Transparent YAG-based glass-ceramics were prepared by a novel method called amorphous sintering followed by controlled crystallization (ASCC) from the compositions of 62.5Al(2)O(3)-(37.5-x)Y2O3-xLa(2)O(3) (in molar ratio, x=5, 7, 10 and 20). The stability of the YAG glass was improved by the incorporation of La2O3, which increased the activation energy for crystallization. With 10 mol% La2O3, bulk YAG glass was prepared by hot-pressing and showed an infrared transmittance of 66%. The YAG glass was converted into glass-ceramics by post annealing at 875 degrees C for 5 h for controlled crystallization. The obtained glass-ceramic sample showed a crystallite size of 20-50 nm and an infrared transmittance of 60%. With increasing annealing time, the crystallites grew up quickly, resulting in a significant decrease in transparency. In the hot-pressed glass, nano-sized YAG nuclei (similar to 5 nm) were found, which were probably responsible for the crystallization behavior observed at temperatures (e.g. 875 degrees C) below the onset crystallization temperature.
|Subjects:||Material Science > Functional and hybrid materials|
|Deposited On:||23 Sep 2012 13:34|
|Last Modified:||23 Sep 2012 13:34|
Repository Staff Only: item control page