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Phase equilibria in the La2O3-Sm2O3-ZrO2 system: Experimental studies and thermodynamic modeling
Affiliation:1. Guangxi Key Laboratory of Processing for Non–ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China;2. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;3. Centre of Excellence for Advanced Materials, Dongguan, China;1. School of Metallurgy, Northeastern University, Shenyang 110819, PR China;2. State key laboratory of rolling and automation, Northeastern University, Shenyang 110819, PR China;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China;3. Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Physics of the Czech Academy of Sciences, 16200, Prague, Czech Republic;4. King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;1. Institute for Single Crystals NAS of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine;2. SSI “Institute for Single Crystals”, NAS of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine;1. Laboratory of Thin Film Techniques and Optical Test, Xi''an Technological University, Xi’an 710032, Shaanxi, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi''an 710049, China;3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, China;4. Physics Department, Faculty of Science, Tanta University, Al-Geish st., Tanta 31527, Egypt;1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China;2. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
Abstract:A series of ceramic samples were prepared to experimentally investigate sub-solidus phase relations in the La2O3-Sm2O3-ZrO2 system at 1873 K and 1673 K. No ternary compounds have been observed, while the binary La2Zr2O7 and Sm2Zr2O7 pyrochlore phases form a continuous solid solution La2?xSmxZr2O7 in the ternary system at the selected temperatures. X-ray diffraction and microstructure results demonstrated that the pyrochlore phase is stable in the ZrO2-rich corner. The homogeneity range of the pyrochlore phase was carefully determined and the phase boundary of the cubic ZrO2 (fluorite phase) which extends into the ternary system was also constructed via electron probe microanalysis. The as-obtained data were adopted to determine the mixing parameters for the pyrochlore and fluorite phases in the present thermodynamic modeling. A self-consistent database of the La2O3-Sm2O3-ZrO2 system was accordingly established for the first time and the calculations agree well with the experimental data in the current work.
Keywords:Phase diagram  Zirconia  Rare earth  CALPHAD modeling
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