Effects of ZrO2-La2O3 co-addition on the microstructural and optical properties of transparent Y2O3 ceramics |
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| Affiliation: | 1. Engineering Ceramics Department, Korea Institute of Materials Science 797 Changwondaero, Changwon, Gyeongnam 641-831, Republic of Korea;2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, Hubei 430062 China;1. Institute of Electrophysics UB RAS, Amundsen St. 106, Ekaterinburg 620016, Russia;2. Ural Federal University named after the first President of Russia B.N. Yeltsin, Mira St. 19, Ekaterinburg 620002, Russia;1. Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran;2. Nanotechnology & Water Sustainability Research Unit, College of Science, Engineering & Technology, University of South Africa, Florida Science Campus, 1709, Johannesburg, South Africa;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Tokyo University of Agriculture and Technology, Tokyo 183-8538, Japan;1. Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China;2. University of Chinese Academy of Science, Beijing 100049, China;1. Engineering Ceramics Department, Korea Institute of Materials Science 797 Changwondaero, Changwon, Gyeongnam, 641-831, Republic of Korea;2. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, Hubei, 430062, China |
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| Abstract: | Commercial Y2O3 powder was used to fabricate Y2O3 ceramics sintered at 1600 °C and 1800 °C with concurrent addition of ZrO2 and La2O3 as sintering aids. One group with different contents of La2O3 (0–10 mol%) with a fixed amount of 1 mol% ZrO2 and another group with various contents of ZrO2 (0–7 mol%) with a fixed amount of 10 mol% La2O3 were compared to investigate the effects of co-doping on the microstructural and optical properties of Y2O3 ceramics. At low sintering temperature of 1600 °C, the sample single doped with 10 mol% La2O3 exhibits much denser microstructure with a few small intragranular pores while the samples with ZrO2 and La2O3 co-doping features a lot of large intergranular pores leading to lower density. When the sintering temperature increases to 1800 °C, samples using composite sintering aids exhibit finer microstructures and better optical properties than those of both ZrO2 and La2O3 single-doped samples. It was proved that the grain growth suppression caused by ZrO2 overwhelms the acceleration by La2O3. Meanwhile, 1 mol% ZrO2 acts as a very important inflection point with regard to the influence of additive concentration on the transmittance, pore structure and grain size. The highest in-line transmittance of Y2O3 ceramic (1.2 mm in thickness) with 3 mol% of ZrO2 and 10 mol% of La2O3 sintered at 1800 °C for 16 h is 81.9% at a wavelength of 1100 nm, with an average grain size of 11.2 µm. |
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| Keywords: | Transparent ceramic Composite sintering aids Grain size Optical properties |
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