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Interaction of Cerium, Lanthanum, and Samarium Oxides at 1250°C

  • PHYSICOCHEMICAL MATERIALS RESEARCH
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Powder Metallurgy and Metal Ceramics Aims and scope

Materials produced from cerium oxides stabilized by rare-earth metal (REM) oxides are promising for medical and engineering applications for their unique properties. The CeO2–La2O3–Ln2O3 phase diagrams serve as a physicochemical basis for developing solid electrolytes for fuel cells, oxygen sensors, catalyst carriers, protective coatings on alloys, etc. Phase equilibria and structural transformations in the CeO2–La2O3–Sm2O3 system at 1250°C were studied by X-ray diffraction over the entire composition range. The studies revealed fields of solid solutions based on the cubic (F) fluorite-type modification of CeO2, monoclinic (B) and cubic (C) modifications of Sm2O3, and hexagonal (A) modification of La2O3 in the ternary CeO2–La2O3–Sm2O3 system at 1250°C had predominantly cubic phases in equilibrium: CeO2-based F-phase with Fm3m space group and Sm2O3-based C-phase with Ia3 space group. The lattice parameters of the fluorite-type (F-CeO2) cubic solid solutions changed from a = 0.5409 nm for pure CeO2 to a = 0.5515 nm for the two-phase (F + C) 55 CeO2–22.5 La2O3–22.5 Sm2O3 sample (mol.%) along section La2O3 : Sm2O3 = = 1 : 1, to a = 0.5548 nm for the two-phase 55 CeO2–33.75 La2O3–11.25 Sm2O3 sample along section La2O3: Sm2O3 = 3 : 1, and to a = 0.5478 nm for the two-phase (F + C) 60 CeO2–10 La2O3–30 Sm2O3 sample along section La2O3 : Sm2O3 = 1 : 3. At 1250°C, the cubic F-CeO2 fluorite-type solid solutions are in equilibrium with all phases formed in the system. The isothermal section of the CeO2–La2O3–Sm2O3 phase diagram at 1250°C contains two three-phase (A + F + B, F +B + C) and five two-phase (A + F, A + B, F + B, B + C, F + C) regions.

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Acknowledgements

The authors are grateful to the Ministry of Education and Science of Ukraine (Grant No. M/56-2020, Joint Ukraine–Belarus project).

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    O.A. Korniienko, O.R. Andrievskaya, O.I. Bykov & S.V. Yushkevych

  2. Scientific-Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, Belarus

    V.S. Urbanovich

  3. National Technical University ‘Igor Sikorsky Kyiv Polytechnic Institute’, Kyiv, Ukraine

    L.M. Spasonova

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  1. O.A. Korniienko
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  2. O.R. Andrievskaya
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  3. O.I. Bykov
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Correspondence to O.A. Korniienko.

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O.R. Andrievskaya is deceased

Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 1–2 (537), pp. 121–132, 2021.

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Korniienko, O., Andrievskaya, O., Bykov, O. et al. Interaction of Cerium, Lanthanum, and Samarium Oxides at 1250°C. Powder Metall Met Ceram 60, 97–104 (2021). https://doi.org/10.1007/s11106-021-00219-z

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  • DOI: https://doi.org/10.1007/s11106-021-00219-z

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