Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C |
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| Affiliation: | 1. Graduate Program in Materials Science and Engineering (PPGCEM), Materials Microstructure Engineering Group (GEMM), FIRE Associate Laboratory, Materials Engineering Department, Federal University of São Carlos, Rodovia Washington Luis, Km 235, São Carlos, SP, 13565-905, Brazil;2. Graduate Program in Materials Science and Engineering (PPGCEM), Smart Materials Research Team (SMaRT), Materials Engineering Department, Federal University of São Carlos, Rodovia Washington Luis, Km 235, São Carlos, SP, 13566-905, Brazil;3. Laboratory of Research Eletrochemistry (LaPE), Chemistry Department, Federal University of São Carlos, Rodovia Washington Luis, Km 235, São Carlos, SP, 13566-905, Brazil;4. College of Technology (FATEC Sertãozinho), Jordão Borghetti Street 480, Sertãozinho, SP, 14160-050, Brazil;1. Institut de Recherche sur les Céramiques (IRCER), UMR 7315 CNRS, Université de Limoges, Centre Européen de la Céramique, Limoges, France;2. Xlim, UMR 7252 CNRS, Université de Limoges, France;3. LSI, CEA/DRF/IRAMIS, École Polytechnique, CNRS, Institut Polytechnique de Paris, F-91128 Palaiseau, France;4. Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), UPR3079 CNRS, Orléans, France;1. Biomaterials, Biomechanics and Tissue Engineering Group (BBT), Department of Materials Science and Engineering, Universitat Politècnica de Catalunya - BarcelonaTECH, 08019 Barcelona, Spain;2. Center for Structural Integrity, Micromechanics and Reliability of Materials (CIEFMA), Department of Materials Science and Engineering, Universitat Politècnica de Catalunya - BarcelonaTECH, 08019 Barcelona, Spain;3. Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya - BarcelonaTECH, 08019 Barcelona, Spain;4. Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Technology (BIST), 08028 Barcelona, Spain;1. Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei-shi, Tokyo 184-8588, Japan;2. Japan Aerospace Exploration Agency (JAXA), 6-13-1, Osawa, Mitaka-shi, Tokyo 181-0015, Japan;1. G.G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, Nizhny Novgorod, Russia;2. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia;3. Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia;1. Department of Chemistry, Kalasalingam University, Krishnankoil, 626126, India;2. Department of Chemistry, Thiagarajar College of Engineering, Madurai 625015,India;3. Graduate School of Electronic Science and Technology, Research Institute of Electronics, Shizuoka University, Hamamatsu 432-8011, Japan |
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| Abstract: | Materials based on CeO2–La2O3–Er2O3 system are promising candidates for a wide of applications, but the phase relationship has not been studied systematically previously. To address this challenge, the isothermal section of the phase diagram for 1500 °C was investigated. The phase relations in the CeO2–La2O3–Er2O3 ternary system at 1500 °C were studied by X-ray diffraction and scanning electron microscopy in the overall concentration range. To study phase relationships at 1500 °C the as-repared samples were thermally treated in two stages: at 1100 °C (for 300 in air) and then at 1500 °C (for 70 h in air) in the furnaces with heating elements based on Fecral (H23U5T) and Superkanthal (MoSi2), respectively. The solid solutions based on various polymorphous forms of constituent phases and with perovskite-type structure of LaErO3 (R) with orthorhombic distortions were revealed in the system. No new phases were found. The isothermal section of the phase diagram for the CeO2–La2O3–Er2O3 system has been constructed. It was established that in the ternary CeO2–La2O3–Er2O3 system there exist fields of solid solutions based on hexagonal (A) modification of La2O3, cubic modification of CeO2 with fluorite-type structure (F), cubic modification Er2O3 and with perovskite-type structure of LaErO3 (R) with orthorhombic distortions. The maximal solubility of ceria in LaErO3 was found to be around ～ 2 mol% CeO2 along the section CeO2–(50 mol % La2O3 –50 mol% Er2O3). |
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| Keywords: | Lanthanum and erbium Cerium oxides Phase equilibria Solid solutions Functional and structural ceramics |
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