烧结
材料科学
微观结构
陶瓷
掺杂剂
兴奋剂
晶粒生长
晶界
粒度
晶界扩散系数
化学工程
矿物学
冶金
光电子学
化学
工程类
作者
Shiwei Deng,Lexing Liang,Zhe Tang,Haifeng Yuan,Cong Zhang,Zijie Li,Junjing Duan,Jianqi Qi,Tiecheng Lu
摘要
Calcium oxide (CaO) as sintering additive was first used to fabricate La0.4Gd1.6Zr2O7 transparent ceramics by a simple solid-state reaction and one-step vacuum sintering method. The effects of CaO dopant amount on the densification, as well as sintering behaviors and microstructure evolution of the as-fabricated La0.4Gd1.6Zr2O7 ceramics, were systematically investigated. Under the different sintering temperatures, the relationships during the sintering process between grain growth and zpore elimination were analyzed as well. It was found that 0.1 wt% CaO doping can effectively control the rate of grain growth and promote densification dominated by surface diffusion. Furthermore, Ca2+ entered the lattice of La0.4Gd1.6Zr2O7 ceramics to accelerate ion diffusion and suppress grain boundary migration. With the introduction of 0.1 wt% CaO doping, the highly transparent La0.4Gd1.6Zr2O7 ceramics (T = 80.4% at 1100 nm) were successfully fabricated at the traditional sintering temperature (1850°C).
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