Influence of Yb Substitution for La on Thermophysical Property of La2AlTaO7 Ceramics |
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| Affiliation: | 1. School of Civil Engineering, Henan Institute of Engineering, Zhengzhou 451191, PR China;2. College of Science, Henan Institute of Engineering, Zhengzhou 451191, PR China;3. School of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 451191, PR China;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials, Donghua University, Shanghai 201620, People''s Republic of China;2. Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University, Shanghai 201620, People''s Republic of China;1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea;2. Department of Nanotechnology and Advanced Material Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea;3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan;4. Graduate School of Science and Technology, Niigata University, Niigata, Japan;5. Department of Chemistry, Okayama University of Science, Okayama 700-0005, Japan;1. Key Laboratory for Magnetism and Magnetic Materials, Ministry of Education, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou 730000, China;3. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730000, China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China;2. School of Electrical and Electronic Engineering, Anhui Science and Technology University, Fengyang, 233100, China;3. Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangdong Research Institute of Rare Metals, Guangzhou, 510651, China |
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| Abstract: | The (La1?xYbx)2AlTaO7 ceramics were synthesized by pressureless sintering process at 1600 °C for 10 h in air. The crystal phase, microstructure and thermophysical properties were investigated. Results show that pure (La1?xYbx)2AlTaO7 cermics with single weberite structure are prepared successfully. Owing to the reduction of crystal-lattice tolerance-factor, the thermal conductivity of (La1?xYbx)2AlTaO7 (x>0) ceramics increases with increasing Yb2O3 fraction at identical temperatures, which is lower than that of La2AlTaO7. Due to the relatively high electro-negativity of Yb element, the addition of Yb2O3 increases the thermal expansion coefficient of (La1?xYbx)2AlTaO7 ceramics. |
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| Keywords: | Thermal barrier coatings Thermal conductivity Thermal expansion coefficient |
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