Phase Equilibrium in the Ternary CeО₂-La₂O₃-Yb₂O₃ System at 1500 °С

Abstract:

Materials based on cerium oxides and REE are perspective for use in medicine, energy and mechanical engineering due to the uniqueness of their authorities. Stationary system diagrams are the physicochemical basis for the creation of such materials as solid electrolytes for fuel comics, oxygen gas sensors, catalyst carriers, protected coatings for alloys, etc. In this work, phase equilibria and structural transformations in the system CeO₂-La₂O₃-Yb₂O₃ at a temperature of 1500 oС in all international concentrations are investigated by the methods of microstistructural and X - ray phase analysis. It is established that in the triple system CeO₂-La₂O₃-Yb₂O₃ fields of solid solutions based on cubic (F) modification of the structure of the structure of fluorite CeO₂, monoclinic (B) and cubic (C) modification of Yb₂O₃ and hexagonal (A) modification of La₂O₃ (R) are used, which crystallizes in a Perovski-type structure with rhombic curvatures. It was found that the rarefaction of CeO₂ in the crystal lattice of the ordered phase with the structure of the perovskite type LaYbO₃ (R) is ~ 3 mol. %. Isothermal review of the state diagram of the systems CeO₂-La₂O₃-Yb₂O₃ at reveals the presence of two three-phase (F + C + R), (A + R + F) and five two-phase (A + F), (A + R), (R + C), (F + R), (F + C) regions.

• Periodical: Solid State Phenomena (Volume 331)
• Pages: 159-172
• DOI: https://doi.org/10.4028/p-4000g3
• Online since: April 2022
• Authors: Oksana Kornienko*, Serhii Yushkevych, Oleksandr Bykov, Anatoliy Samelyuk, Yurii Bataiev
• Keywords: Functional Ceramics, Periods of Crystal Lattices, Phase Equilibria, Solid Solutions

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