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Published on: July 2, 2012
Effect of (Tb+Y)/Al ratio on Microstructure Evolution and Densification Process of (Tb0.6Y0.4)₃Al₅O12 Transparent
Zhong Wan1,2,3, Yinzhen Wang4, Jian Zhang5,6,7
1Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials, Guangdong Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics & Telecommunication Engineering, South China Normal University, Guangzhou 510006, China. 2016021673@m.scnu.edu.cn.
Abstract:
(Tb0.6Y0.4)₃Al₅O12 transparent ceramics were successfully fabricated by solid-state reactive sintering using Tb₄O₇, Y₂O₃, and α-Al₂O₃ powders as raw materials. The effect of (Tb+Y)/Al ratio on microstructure evolution and densification process was investigated in detailed. The results showed that the grain growth kinetics were significantly affected by (Tb+Y)/Al ratio. Al-rich and Tb-rich phases appeared in part of the samples of different ratios. Particularly, excess aluminum increased the diffusing process, leading to a higher densification rate, while samples with excess terbium ratios displayed a smaller grain size and lower relative density. The optical quality was highly related to the amount of the secondary phase produced by different (Tb+Y)/Al ratios. Finally, (Tb0.6Y0.4)₃Al₅O12 transparent ceramics have been fabricated through pre-sintering in vacuum, followed by hot isostatic sintering (HIP), and the best transmittance of sample with a 4 mm thickness was approximately 78% at 1064 nm.
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