Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C

Kornienko, O. A.; Sameljuk, A.V.; Bykov, О.І.; Yurchenko, Yu.V.; Barshchevskaya, A.K.

doi:10.1016/j.jeurceramsoc.2020.04.042

Cited by 10 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the transition to the yttrium subgroup in the systems of this series, the formation of an ordered phase with a perovskite-type structure LaLnO3 is observed. Significant dissolution of Ce 4+ in the crystal lattice of an ordered structure of the perovskite type is not observed [35].…”

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

confidence: 95%

“…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%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 95%

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

View full text Add to dashboard Cite

show abstract

“…One potential approach to minimizing/avoiding polaron hopping between Ce and Pr is through decreasing the available hopping sites by decreasing the content of Ce and Pr. However, the fluorite structure is lost at Ce concentrations below 60 at.% of cations in traditional doped ceria and the fluorite structure transitions to other structures that might be less accommodating for oxygen ion mobility [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Zr-doping on the structure and transport properties of rare earth high-entropy oxides

Kante,

Lakshmi Nilayam,

Kreka

et al. 2024

J. Phys. Energy

View full text Add to dashboard Cite

Fluorite-type ceria-based ceramics are well established as oxygen ion conductors due to their high conductivity superseding state-of-the-art electrolytes like yttria-stabilized zirconia. However, at specific temperature and oxygen partial pressure, they occasionally exhibit electronic conduction attributed to polaron hopping via multivalent cations (e.g. Pr and Ce). (Ce, La, Sm, Pr, Y)O2-δ is a high-entropy oxide with a fluorite-type structure, featuring low concentrations of multivalent cations which could potentially mitigate polaron hopping. However, (Ce, La, Sm, Pr, Y)O2-δ undergoes a structural transition to the bixbyite-type structure above 1000 °C. In this study, we introduce Zr doping into (Ce, La, Pr, Sm, Y)O2-δ to hinder the structural transition at elevated temperatures. Indeed, fluorite structure at elevated temperatures is stabilized at approximately 10 at.% Zr doping. The total conductivity initially increases with doping, peaking at 5 at.% Zr doping, and subsequently decreases with further doping. Interestingly, electronic conductivity in (Ce, La, Pr, Sm, Y)1-xZrxO2-δ under oxidizing atmospheres is not significant and is lowest at 8 at.% Zr. These results suggest that ceria-based high entropy oxides can serve as oxygen ion conductors with significantly reduced electronic contribution. This work paves the way for new compositionally complex electrolytes as well as protective coatings for solid oxide fuel cells.

show abstract

“…The polaron conductivity and luminescent mechanisms of the lanthanides (Ln) derived from 4f-4f transition have been studied for the past few decades [1][2][3][4][5] and gained extensive attention in various fields, such as thinfilm crystals, 6 multifunctional ceramics, 7,8 laser emitters, 9 photocatalysts, 10,11 gas phase sensors, 12,13 and so on.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

et al. 2022

View full text Add to dashboard Cite

Solid‐solution ceramics show a potential in the field of electronic devices. In particular, it is necessary to investigate the photoluminescence and conductive properties of CaEuNbMoO8 (CENMO) solid solution ceramics. It is demonstrated that the sintered ceramics appear as CaMoO4 phase with scheelite structure. The results of X‐ray photoelectron spectroscopy show that the abnormal reduction of Eu3+→Eu2+ occurs in the ceramics, which is due to the formation of VCa′′$V_{Ca}^{^{\prime\prime}}$ vacancy caused by the substitution of Ca2+ by Eu3+, making it act as electron donors. The change of local symmetry of Eu3+ ions in ceramics results in a strong red fluorescence, and the charge transition between Eu, Nb, and Mo ions and O ions in the host lattice results in the near‐ultraviolet (near‐UV) excitation. As a result, CaEuNbMoO8 ceramic materials have promising applications in both near‐ultraviolet excited light‐emitting diodes and thermistors.

show abstract

Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C

Cited by 10 publications

References 22 publications

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

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

Influence of Zr-doping on the structure and transport properties of rare earth high-entropy oxides

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Contact Info

Product

Resources

About

Phase relation studies in the CeO2–La2O3–Er2O3 system at 1500°C

Cited by 10 publications

References 22 publications

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

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

Influence of Zr-doping on the structure and transport properties of rare earth high-entropy oxides

Photoluminescence and conductive properties of CaEuNbMoO8 solid‐solution ceramics

Contact Info

Product

Resources

About

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics