Preparation of LuAG Powders with Single Phase and Good Dispersion for Transparent Ceramics Using Co-Precipitation Method
Abstract
:1. Introduction
2. Results and Discussion
Samples | Aging Time | Dripping Speed | pH Value of Initial Salt Solution | pH Value of Terminal Solution |
---|---|---|---|---|
S1 | 1 h | 3 mL·min−1 | 3.10 | 7.77 |
S2 | 15 h | 3 mL·min−1 | 3.10 | 7.86 |
S3 | 24 h | 3 mL·min−1 | 3.10 | 8.04 |
S4 * | 0.5 h | 3 mL·min−1 | 3.10 | 8.35 |
S5 | 24 h | 3 mL·min−1 | 1.20 | 7.32 |
S6 | 1 h | 1.5 mL·min−1 | 3.10 | 7.90 |
S7 | 15 h | 6 mL·min−1 | 3.10 | 7.61 |
3. Experimental Section
4. Conclusions
- 1
- The Combined effect of pH and time. Higher pH value of terminal solution, longer titration time, and longer aging time resulted in the appearance of rhombus Lu precipitates.
- 2
- The evolution of impurities. From the morphology of flake-like Lu2O3, it is obvious that rhombus Lu precipitate transformed into Lu2O3 upon calcinations at 1200 °C for 3 h. It is not easy for big sized rhombus Lu precipitate to react with fine Al precipitate to transform into LuAG phase because of long diffusion distance. As a consequence, there were two kind of impurity phases in the LuAG powder of S3, one was flake-like Lu2O3, the other was fine Al2O3.
- 3
- The dispersity of powder. It is an easy way to obtain well dispersed LuAG powder by calcining at different temperatures. Higher calcination temperature resulted in drastic increase in crystallite size and severed agglomeration with decreasing sinterability. While the powders produced at lower temperature, smaller crystallite size, and high sintering activity caused to abnormal grain growth and intragranular porosity in the sintering process. The excellent dispersion and sintering properties of powder need to further change synthesis conditions, including species and dosage of dispersant, co-precipitation temperature and so on.
- 4
- The transmittance of ceramics. It is true that our samples were not as transparent as solid-state reactive sintered LuAG laser ceramics. However, there is a strong segregation of rare earth ions at grain boundaries in solid-state reactive sintered ceramics, which affects the performance in laser applications. Using synthesized nano-powders via AHC co-precipitation could solve this problem. Besides, the transmittance of our samples is superior or comparable to LuAG ceramics using the synthesized LuAG nano powders via AHC co-precipitation method recently reported results. Decreasing the agglomeration of the synthesized LuAG nano-powders, refining forming, and optimizing the sintering process can improve the transmittance of transparent LuAG ceramics. Research on these subjects are underway in our laboratory.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Pan, L.; Jiang, B.; Fan, J.; Yang, Q.; Zhou, C.; Zhang, P.; Mao, X.; Zhang, L. Preparation of LuAG Powders with Single Phase and Good Dispersion for Transparent Ceramics Using Co-Precipitation Method. Materials 2015, 8, 5363-5375. https://doi.org/10.3390/ma8085247
Pan L, Jiang B, Fan J, Yang Q, Zhou C, Zhang P, Mao X, Zhang L. Preparation of LuAG Powders with Single Phase and Good Dispersion for Transparent Ceramics Using Co-Precipitation Method. Materials. 2015; 8(8):5363-5375. https://doi.org/10.3390/ma8085247
Chicago/Turabian StylePan, Liangjie, Benxue Jiang, Jintai Fan, Qiuhong Yang, Chunlin Zhou, Pande Zhang, Xiaojian Mao, and Long Zhang. 2015. "Preparation of LuAG Powders with Single Phase and Good Dispersion for Transparent Ceramics Using Co-Precipitation Method" Materials 8, no. 8: 5363-5375. https://doi.org/10.3390/ma8085247