PHASE RELATIONS FOR THE TERNARY CeO2-Lа2O3-Er2O3 SYSTEM at 1100 ºС IN AIR
DOI:
https://doi.org/10.15421/jchemtech.v34i2.348373Keywords:
phase equilibria, phase diagram, solid solution, lattice parameters, functional ceramicsAbstract
The article presents the results of the investigation of phase equilibria in the ternary system CeO₂–La₂O₃–Er₂O₃. Samples of various compositions were synthesized and subjected to thermal treatment at 1100 °C. Based on the experimental data obtained, an isothermal section of the system at 1100 °C was constructed. The existence of the following solid solutions was established: F–CeO₂, C–Er₂O₃, A*–La₂O₃, as well as an ordered phase with a perovskite-type structure, LaErO₃. It was determined that the solubility of cerium dioxide in the crystal lattice of the ordered perovskite-type phase is 1%. According to X-ray phase analysis, the experimental sample with the composition 1 mol.% CeO₂ – 49.5 mol.% La₂O₃ – 49.5 mol.% Er₂O₃ belongs to the two-phase region (R(LaErO₃) + C), whereas increasing the cerium dioxide content to 2 mol.% leads to the stabilization of a third phase with a cubic fluorite-type structure.
The study also revealed that along the CeO₂ – (50 mol.% La₂O₃ – 50 mol.% Er₂O₃) section, the lattice parameter of fluorite-type solid solutions increases with composition, from a = 0.5414 nm for the single-phase composition (95 mol.% CeO₂ – 2.5 mol.% La₂O₃ – 2.5 mol.% Er₂O₃), to a = 0.5464 nm for the two-phase composition (F + C, 65 mol.% CeO₂ – 17.5 mol.% La₂O₃ – 17.5 mol.% Er₂O₃), and to a = 0.5464 nm for the three-phase composition (F + C + R, 40 mol.% CeO₂ – 30 mol.% La₂O₃ – 30 mol.% Er₂O₃). It was established that under the conditions applied in this experiment, no new phases formed in the investigated ternary system.
The isothermal section of the CeO₂–La₂O₃–Er₂O₃ phase diagram at 1100 °C contains four homogeneous solid solution regions: F–CeO₂, A–La₂O₃, C–Er₂O₃, and LaErO₃. According to Gibbs’ phase rule, these regions are bounded by two- and three-phase regions: the two-phase regions are (A + R), (A + F), (R + F), (R + C), (F + C); the three-phase regions are (A + F + R) and (R + F + C)
References
Balaraman, S., Iruson, B., Krishnmoorthy, S., Elayaperumal, M., Sangaraju, S. (2023) Synthesis of Er2O3 blended CeO2 nanocomposites and investigation of their biomedical applications. Chemical Physics Impact, 6, 100167. https://doi.org/10.1016/j.chphi.2023.100167
Monroy-Ramirez, H. Ch., Salto-Sevilla, J., Arceo-Orozco, S., Caloca-Camarena, F., Flores-Pena, R., Lopez-Mena, E., Galicia-Moreno, M., Armendariz-Borunda, J. (2025) Cerium oxide nanoparticles: a promising nanotherapy approach for chronic degenerativediseases. Journal of Materials Science: Materials in Engineering, 20, 1-22. https://doi.org/10.1186/s40712-025-00295-8
Abbasi, R., Shineh, G., Mobaraki, M. (2023) Structural parameters of nanoparticles affecting their toxicity for biomedical applications: a review. J. Nanopart Res, 25, 43. https://doi.org/10.1007/s11051-023-05690-w
Abel, E.D., Gloyn, A.L., Evans-Molina, C., Joseph, J.J., Misra, S., Pajvani, U.B., Simcox, J., Susztak, K., Drucker, D.J. (2024) Diabetes mellitus-progress and opportunities in the evolving epidemic. Cell, 187(15), 3789–3820. https://doi.org/10.1016/j.metop.2021.100151
Mustafa, K., Raheel, M., Abro, I. A., Muskan, S., Rizvi, Z., Ma, J., Nazeer, F., GaoShizhen, Zh L., Ma Zh. (2026) Structural properties of CeO2 and CeO2-based composite oxide materials for passive daytime radiative cooling. Inorganic Chemistry Communications, 183, 115791 https://doi.org/10.1016/j.inoche.2025.115791
Yoon, S., Kim, J., An, K. (2025) Strategies for oxygen vacancy formation in CeO2-based materials for thermal catalysis. Chem Catalysis, 5(7), 101423 https://doi.org/10.1016/j.checat.2025.101423
Wang, K., Yang, J., An, B., Zhang, Q., Song, D., Wang, Y. (2024) Mechanical and electrical properties Ge and Gd co-doped CeO2-based electrolyte for intermediate-temperature solid oxide fuel cells. Ceramics International, 50, 37698 https://doi.org/10.1016/j.ceramint.2024.07.131
Waghmare, A. M., Gaikar, P. S., Cui, Ch., Kim, J. M., Bulakhe, R. N., Nagare, B. J. (2026) A review of developments and challenges in advanced anode materials for solid oxide fuel cells. Journal of Power Sources, 663, 238853. https://doi.org/10.1016/j.jpowsour.2025.238853
Xu, Y., Xue, Y., H, Li, Meng B., Liu Y., Li L., W.Wei, H.Wang, Dong Sh. (2025) One stone three birds: hydrophobic, self-healing and UV-resistant polyurethane composite coating based on FPANI@CeO2 for anti-corrosion applications. Composites Part A: Applied Science and Manufacturing, 199, 109236 https://doi.org/10.1016/j.compositesa.2025.109236
Wang, H., Hu, H., Zhou Ch., Wei W., Fan B., Wang H., Dong, Sh. (2023) Fabrication of self-healable superhydrophobic polyurethane coating based on functional CeO2 nanoparticles for long-term anti-corrosion application. Progress in Organic Coatings, 183, 107799 https://doi.org/10.1016/j.porgcoat.2023.107799
Periasamy, P.A., Saravanakumar, B., William, J., Karthikeyan, N., Vadivel, S. (2024) Breaking barriers of CeO2 in energy storage: Hydrothermal energized preparation of mesoporous carbon added CeO2 nanohybrids as supercapacitor electrodes. Electrochimica Acta, 507, 145144 https://doi.org/10.1016/j.electacta.2024.145144
Ghasali, E., Zhang, R., Sadiqa, A., Saleem, Raza, Jie, L., Landarani-Isfahani A., Orooji Y., Karimi-Maleh H. (2025) Conventional, microwave and spark plasma sintering of high entropy rare earth ceramic: La2O3-CeO2-Pr6O11-Nd2O3. Journal of Alloys and Compounds, 185670. https://doi.org/10.1016/j.jallcom.2025.185670
Kirkgeçitб R., Torun, H. Öz. (2020) Synthesis and characterization of CeLaMO2 (M: Sm, Gd, Dy) compounds for solid ceramic electrolytes. Processing and Application of Ceramics, 314, 14.
Stojmenovi M. Niši´ N., Žuni´ M., Basoli F., Gulicovki J., Ristovi´ I., Kragovi´ M. (2022) Development of a new system of solid ionic conductors based on multi-doped ceria for application in IT-SOFCs. Processing and Application of Ceramics, 391, 16. https://doi.org/10.2298/PAC2204391S
Sibieude, F., Schiffmacher, G., Caro, P. (1978) Étude au microscope électronique de structures modulées dans les régions systéme La2O3-CeO2 riches en La2O3. J. Solid State Chemistry, 23(3-4), 367.
Andrievskaya, E. R., Kornienko, O. A., Sameljuk, A. V., Sayir, A. (2011) Phase relation studies in the CeO2–La2O3 system at 1100-1500 °С. Journal of the Europium Ceramic Society, 31, 1277. doi:10.1016/j.jeurceramsoc.2010.05.024
Genel, F., Kucich, P. L., Minichelli, D. (2001) Solid solutions in ternary phase diagram CeO2–ZrO2–Er2O3 using pyrolitic precursors. British Ceramic Transactions, 100(4), 155–158.
Andrievskaya, Е. R., Gusarov, V. V., Коrnienko, О. А., Sameljuk, A. V. (2012) Interaction of ceria and erbia at 1500 °С. Proc. of Berezhnyi Institute for refractories, 112, 133–140.
Mandal, B. P., Roy, M., Grover, V., Tyagi, A. (2008) X-ray diffraction, μμ-Raman spectroscopic studies on CeO2−RE2O3 (RE=Ho, Er) systems: Observation of parasitic phases. Journal of Applied Physics. 103, 506.
Аndrievska, О. R., Коrnienko, О. А., Bykov, О. І., Sameliuk, А. V., Bohatyriova, Z. D. (2020) Interaction of ceria and erbia in air within temperature range 1500 – 600 °C. Journal of the European Ceramic Society, 40(8), 3098. https://doi.org/10.1016/j.jeurceramsoc.2020.03.002
Schneider S. I., Roth R. S. (1960) Phase Equilibria in Systems Involving the Rare-Earth Oxides. Part II. Solid State Reactions in Trivalent Rare-Earth Oxide Systems. Journal of Res. National Bureau of Standards-A. Physics and Chem. 64(4), 322.
Traverse, J.P. (1971). Etude du Polymorphisme des sesquioxydes de terres rares. These. Grenoble.
Coutures, J., Rouanet, A., Verges, R., Foex, M. (1976) Etude a haute temperature des systems formes par le sesquioxyde de lanthane et les sesquioxydes de lanthanides. I. Diagrammes de phases (1400 oC < T < T Liquide). Journal Solid State Chem. 17(1-2), 172.
Kornienko, O.A., Andrievskaya, E.R., Samelyuk, A.V., (2018) Interactions between oxides lanthanum and erbium at 1500 C. Ukrainian Chemistry Journal, 84(6), 95.
Zinkevich M. (2007) Thermodynamics of rare earth sesquioxides. Progress Material Science, 52, 647.
Zhang Y. (2016). Thermodynamic Properties of Rare Earth Sesquioxides. Supervisor Prof In-ho Jung McGill University, Montreal, QC, Canada.
Kornienko, O.A., Chudinovych, O.V., Bykov, A.I., Samelyuk, A.V., Andrievskaya, E.R. (2019) Phase equilibria in the La2O3–Er2O3 system in the temperature range 1100–1500°C. Powder Metallurgy and Metal Ceramics, 58(1-2), 89
Lopato, L.M., Shevchenko, A.V., Kushchevsky, A.E., Tresvyatsky, S.G. (1974). Polimorfnye prevrashcheniya okislov redkozemel'nykh elementov pri vysokikh temperaturakh. Izv. Akad. Nauk. Neorgan. Mater., 10(8), 1481–1487.
Kornienko, O.A., Sameljuk, A.V., Bykov, O.І.,
Yurchenko, Yu.V., Barshchevskaya A.K. (2020) Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C. Journal of the European Ceramic Society, 40, 4184. https://doi.org/10.1016/j.jeurceramsoc.2020.04.042
Materazzi, S. (2008) Coordination Compounds and Inorganics. Handbook of Thermal Analysis and Calorimetry, 5, 478.
Andrievskaya, E. R. (2010) Phase Equilibria in the systems of Hafnia, Yttria with rare-earth Oxides. Scientific book Project, Kiev, Naukova Dumka.
Zhang, X., Yang, P., Wang, D., Xu, J., Li, Ch., Gai, Sh., Lin, J. (2012) La(OH)3:Ln3+ and La2O3:Ln3+ (Ln = Yb/Er, Yb/Tm, Yb/Ho) Microrods: Synthesis and Up-conversion Luminescence Properties. Cryst. Growth Des. 12(1), 306–312. https://doi.org/10.1021/cg201091u
Korniienko, O.A., Bykov, O.I., Sameljuk, A.V.,
Bataiev, Yu. M., Yushkevych, S.V. (2021) Phase equilibria in the CeO2–La2O3–Gd2O3 system at 1250 and 1500 °С. International Research Journal of Multidisciplinary Technovation, 3(4), 17 https://doi.org/10.34256/irjmt2143
Kornienko, O., Bykov, O., SameliukА., Yurchenko, Y. (2020) Phase relation studies in the CeO2-La2O3-Eu2O3 system at 1250 °С. Ukrainian Chemistry Journal, 86(3), 35. https://doi.org/10.33609/0041-6045.86.3.2020.35-47
Korniienko, O.A., Yushkevych, S.V., Bykov, O.I., Samelyuk, A.V., Bataiev, Yu. M., Zamula, M.V. (2022). Phase equilibrium in binary La2O3-Dy2O3 and ternary CeO2-La2O3-Dy2O3 systems. Journal of the European Ceramic Society. 42. 5820–5830. https://doi.org/10.1016/j.jeurceramsoc.2022.06.045
Korniienko, O.A., Andrievskaya, O.R., Bykov, O.I., Urbanovich, V.S., Yushkevych, S.V., Spasonova L.M. (2021) Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C Powder Metall Met Ceram, 60, 97. https://doi.org/10.1007/s11106-021-00219-z
Kornienko, O., Yushkevych, S., Bykov, O., Samelyuk, A., Bataiev, Y. (2022) Phase Equilibrium in the Ternary CeО2-La2O3-Yb2O3 System at 1500 °С. Solid State Phenomena. 331, 159 https://doi.org/10.4028/p-4000g3
Korniienko, O.A., Yushkevych, S.V., Bykov, O.I., Samelyuk, A.V., Bataiev, Yu. M., Zamula, M.V. (2023) Phase relation studies in the CeO2–La2O3–Ho2O3 system at temperature of 1500 °С Materials Today Communications, 35, 105789 https://doi.org/10.1016/j.mtcomm.2023.105789
Kolesnichenko, V., Yurchenko, Y. V., Korniienko, O. A., Zamula, M.V., Samelyuk, A.V., Shyrokov, O.V.,
Tomila, T.V., Ragulya, A.V., Kotko, A. (2023) Spark plasma sintering of a ceramic material with a LaLuO3 perovskite-type structure. Nano Hybrids and Composites, 43, 1.
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