Crystallization kinetics of Al2O3-26mol%Y2O3 glass and full crystallized transparent Y3Al5O12-based nanoceramic
Crystallization kinetics of Al2O3-26mol%Y2O3 glass and full crystallized transparent Y3Al5O12-based nanoceramic
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结晶%20动力学%20of%20Al2O3-26mol%Y2O3%20玻璃%20and%20full%20结晶%20透明%20Y3Al5O12基%20纳米陶瓷
DOI：
10.1016/j.jeurceramsoc.2020.09.036
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发表时间：
2021
影响因子：
5.7
通讯作者：
Jianqiang Li
中科院分区：
文献类型：
--
作者：
Ying Zhang;Xiaoguang Ma;Xiaoyu Li;Lixia Yang;Binghui Ge;Mathieu Allix;Jianqiang Li
具有过量Al 2 O3组分的透明Y3 Al 5 O 12基多晶陶瓷（Al 2 O3 -26 mol%Y2O3，AY 26）已被证明是潜在的荧光粉应用主体材料。然而，AY 26玻璃的析晶机理至今尚未得到深入研究。本文对AY 26玻璃的非等温析晶动力学进行了实验研究。AY 26玻璃表现出高激活能和体积形核的结晶机制，随后是三维晶体生长模式。在此基础上，采用无压玻璃晶化法，在963 ℃低温下制备了一种新型的高透明YAG-Al 2 O3纳米陶瓷材料。该双相纳米陶瓷的特征在于YAG纳米晶体被均匀的薄Al 2 O3层包围的结构。从可见光到中红外波段都是极透明的，特别是在近红外和中红外波段的透过率可以达到YAG透明陶瓷的理论极限。此外，它的硬度与YAG单晶和YAG透明陶瓷几乎相同，均为21 GPa。
Transparent Y3Al5O12-based polycrystalline ceramics with excessive Al2O3composition (Al2O3-26 mol%Y2O3, AY26) have been demonstrated as potential host materials for phosphor applications. However, the crystallization mechanism of AY26 glass has not been thoroughly investigated so far. In this work, the non-isothermal crystallization kinetics of AY26 glass was experimentally analyzed. The AY26 glass depicts high activation energy and crystallization mechanism of volume nucleation followed by three-dimensional crystal growth mode. Based on the analysis, a novel highly transparent YAG-Al2O3nanoceramic material was elaborated at lower temperature of 963 ℃ by using pressureless glass crystallization. The biphase nanoceramic is characterized by the structure of YAG nanocrystals surrounded with homogeneous thin Al2O3layers. It is extremely transparent from visible to mid-infrared region, particularly the transmittance can reach the theoretical limit of YAG transparent ceramic in NIR and MIR regions. Besides, it has almost same hardness of 21 GPa with YAG single crystal and YAG transparent ceramic.