The interaction between cerium dioxide, lanthanum and europium oxides at 1500°C

Andrievskaya, O.R.; Kornienko, O. A.; Bykov, О.І.; Chudinovich, Olga V.; Spasonova, Larysa

doi:10.2298/pac2101032a

Cited by 7 publications

(8 citation statements)

References 11 publications

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“…The largest region of homogeneity of this isothermal cross-section is occupied by solid solutions with a structure of the fluorite type (F-CeO2). Based on the literature data [32][33][34] and the results obtained in this study, it was found that with a change in one of the components in a number of studied systems CeO2-La2O3-Ln2O3 and, accordingly, a decrease in the ionic radius from Sm 3+ (0.100 nm) to Gd 3+ (0.0972 nm ) there is a decrease in the region of homogeneity of cubic solid solutions of F-CeO2, which is associated with the structure of boundary binary systems. The boundary of the region of homogeneity of the above-mentioned solid solutions extends from the corresponding coordinates in the limiting binary systems CeО2-La2O3 (100-51 mol % CeО2) and CeО2-Gd2O3 (100-85 mol % CeО2).…”

Section: Diagram Of the State Of The La2o3-gd2o3 Systemmentioning

confidence: 99%

“…Based on the obtained data and the results presented in [32][33][34][35], it is possible to determine some characteristics for the state diagrams of the CeO2-La2O3-Ln2O3 series. The largest area of isothermal cross sections of these systems is occupied by cubic solid solutions with a structure of the fluorite type.…”

Section: Isothermal Cross Section Of the State Diagram Of The Ceo2-la2o3-gd2o3 System At 1250 Cmentioning

confidence: 99%

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Phase equilibria in the CeO2–La2O3–Ln2O3 system at 1250 and 1500 °С

O.A

O.I

A.V

et al. 2021

Int. Res. J. multidiscip. Technovation

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Materials based on cerium oxide, stabilized by oxides of rare earth elements, are promising for use in medicine, energy and mechanical engineering due to the uniqueness of their properties. State diagrams of CeO2–La2O3–Ln2O3 systems are the physicochemical basis for the creation of solid electrolytes for fuel cells, oxygen gas sensors, catalyst carriers, protective coatings on alloys, etc. Phase equilibria and structural transformations in CeO2–La2O3–Gd2O3 systems at temperatures 1250 and 1500 °С and in the binary system La2O3–Gd2O3 at temperatures 1100, 1500 and 1600 ° С in the whole range of concentrations were investigated using X-ray phase and microstructural analyzes. It was found that solid solutions based on cubic (F) modification with CeO2 fluorite type, monoclinic (B) and cubic (C) modifications of Gd2O3 and hexagonal (A) modification of La2O3 are formed in the ternary system CeO2–La2O3–Gd2O3. The boundaries of the phase fields and the periods of the crystal lattices of the formed phases are determined. It is established that in the CeO2–La2O3 –Gd2O3 system at 1250 and 1500 °С the phases of cubic symmetry are in equilibrium: on the basis of F–CeО2 with the spatial group Fm3m and C-phase on the basis of Gd2O3 with the spatial group Ia3. As the temperature decreases, there is a narrowing of all areas of homogeneity.

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Section: Diagram Of the State Of The La2o3-gd2o3 Systemmentioning

confidence: 99%

Section: Isothermal Cross Section Of the State Diagram Of The Ceo2-la2o3-gd2o3 System At 1250 Cmentioning

confidence: 99%

Phase equilibria in the CeO2–La2O3–Ln2O3 system at 1250 and 1500 °С

O.A

O.I

A.V

et al. 2021

Int. Res. J. multidiscip. Technovation

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“…The phase relations in the boundary binary systems ZrO2-CeO2 and ZrO2-Eu2O3 were partially studied [13][14][15][16][17][18][19][20][21][22], and the phase equilibria data of the CeO2-Eu2O3 system was reportedly contradictory [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…The state diagram of the ZrO2-Eu2O3 system has been thoroughly studied in the literature [16,17]. The liquidus in the ZrO2-Eu2O3 system is characterized by the eutectic transformation of Le⇆F+X (2130 °С, 26 mol % ZrO2).…”

Section: Introductionmentioning

confidence: 99%

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Phase Equilibrium in ZrO2-CeO2-Eu2O3 System at a Temperature of 1500 °C

Kornienko¹,

Sameljuk²,

Andrievskaya³

et al. 2021

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The phase equilibria and structural transformations in the ternary ZrO2-CeO2-Eu2O3 system at 1500 °C were studied by X-ray diffraction and scanning electron microscopy in the overall concentration range. The system was found to constitute fields of solid solutions based on the tetragonal (Т) modification of ZrО2, cubic (С) and monoclinic (B) modifications of Eu2O3, cubic with a fluorite-type structure (F) modifications of СеО2 (ZrО2), and ordered intermediate phase with a pyrochlore-type structure of Eu2Zr2O7 (Py). The refined lattice parameters of the unit cells corresponding to the solid solutions and microstructures of the definite field of compositions for the systems were determined. The peculiarity of the isothermal section of the phase diagram in the ZrO2-СеO2-Eu2O3 system at 1500 °С is the formation of phase equilibria on the basis of the fluorite solid solutions of ZrO2(CeO2) along with other components. There are at least three homogeneous fields of cubic phases. The isothermal section of the ZrO2-CeO2-Eu2O3 system at 1500 °С was constituted of four three-phase regions (C-Eu2O3 + F-CeO2+Py, C-Eu2O3 + F-ZrO2+Py, Py + F-ZrO2 + T-ZrO2, Py + F-CeO2 + T-ZrO2).

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