Preparation of infrared transparent YAG-based glass-ceramics with nano-sized crystallites

详细信息	查看全文 | 推荐本文 |

• 作者：Li-Li Wang^a ; Lin Mei^b ; ^c ; Gang He^b ; ^c ; Guang-Hua Liu^b ; Jiang-Tao Li^b ; ^{ljt0012@vip.sina.com} ; Li-Hua Xu^a ; Zhi-Jun Jiang^a ; ^b ; ^c ; ^d
• 关键词：YAG ; Transparent glass-ceramic ; Amorphous sintering ; Controlled crystallization
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：September, 2012
• 卷：32
• 期：12
• 页码：3091-3096
• 文件大小：1245 K

摘要

Transparent YAG-based glass-ceramics were prepared by a novel method called amorphous sintering followed by controlled crystallization (ASCC) from the compositions of 62.5Al₂O₃-(37.5 鈭?#xA0;x)Y₂O₃-xLa₂O₃ (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 掳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 (鈭? nm) were found, which were probably responsible for the crystallization behavior observed at temperatures (e.g. 875 掳C) below the onset crystallization temperature.