Sintering and microstructure of rare earth phosphate ceramics REPO4 with RE = La,Ce or Y |
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| Affiliation: | 1. Science des Procédés Céramiques et de Traitements de Surface, Université de Limoges, UMR CNRS 6638, 123, Avenue Albert Thomas, 87060 Limoges, Cedex, France;2. CEA Cadarache, DEN/DEC/SPUA/LTEC, 13108 Saint Paul lez Durance, France;1. Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225, Vilnius, Lithuania;2. Institute of Physics, University of Tartu, 1 W. Ostwald str., Tartu, Estonia;3. A.M. Prokhorov General Physics Institute RAS, 38 Vavilov str., Moscow, Russia;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities, Chengdu University of Information Technology, Chengdu 610225, China;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, China;2. School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China;1. Air Force Research Laboratory, Materials and Manufacturing Directorate, WPAFB, OH 45433, USA;2. UES Inc., Dayton, OH 45432, USA |
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| Abstract: | Sintering of rare earth phosphates REPO4 (RE = La, Ce or Y) was studied using dilatometry. The presence of a secondary rare earth metaphosphate phase RE(PO3)3 as sintering aid was investigated. It proved to accelerate the densification but it activated fast grain growth, which was very detrimental to the microstructural design of processed ceramics. A temperature of 1400–1450 °C was required to sinter pure LaPO4 and CePO4 ceramics with fine grains. Both compounds behave similar while YPO4 did not densify even at 1500 °C. The influence of specific surface area of starting powders, temperature and holding time on the sintering rate and microstructures of dense REPO4 materials is also reported. |
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