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  4. Influence of B-site substituent Ce on thermophysical, oxygen diffusion, and mechanical properties of La₂Zr₂O₇
 
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Influence of B-site substituent Ce on thermophysical, oxygen diffusion, and mechanical properties of La₂Zr₂O₇

Publikationstyp
Journal Article
Date Issued
2023-04-01
Sprache
English
Author(s)
Che, Junwei  
Liu, Xiangyang  
Wang, Xuezhi  
Pagnan Furlan, Kaline  orcid-logo
Zhang, Shengli  
Institut
Keramische Hochleistungswerkstoffe M-9  
Integrated Ceramic-based Materials Systems M-EXK3  
TORE-URI
http://hdl.handle.net/11420/14332
Journal
Ceramics international  
Volume
49
Issue
7
Start Page
10936
End Page
10945
Citation
Ceramics International 49 (7): 10936-10945 (2023-04-01)
Publisher DOI
10.1016/j.ceramint.2022.11.288
Scopus ID
2-s2.0-85143168529
Pyrochlore-type La₂Zr₂O₇ (LZ) is a promising candidate for high-temperature thermal barrier coatings (TBCs). However, its thermal expansion coefficient and low fracture toughness are not optimal for such application and thus, need to be improved. In this study, we systematically report the effect of CeO2 addition on phase formation, oxygen-ion diffusion, and thermophysical and mechanical properties of full compositions La₂(Zr₁−xCex)₂O₇ (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1). La₂(Zr₁−xCex)₂O₇ exhibits a pyrochlore structure at x ≤ 0.3, while a fluorite structure is observed outside this range. With the increase in CeO2 content, thermal expansion coefficient and oxygen-ion diffusivity in La₂(Zr₁−xCex)₂O₇ are increased. Oxygen-ion diffusivity of La₂(Zr₁−xCex)₂O₇ is two orders of magnitude less than that of classical 8YSZ. Among La₂(Zr₁−xCex)₂O₇ compounds, La₂(Zr0.7Ce0.3)₂O₇ and La₂(Zr0.5Ce0.5)₂O₇ exhibit relatively low oxygen diffusivities. The composition La₂(Zr0.5Ce0.5)₂O₇ presents the lowest thermal conductivity due to the strongest phonon scattering and also the highest fracture toughness due to the solid-solution toughening. The highest sintering resistance is achieved by the composition La₂(Zr0.7Ce0.3)₂O₇ because of its ordered pyrochlore structure and high atomic mass of Ce. Based on these results, the compositions La₂(Zr0.5Ce0.5)₂O₇ and La₂(Zr0.7Ce0.3)₂O₇ are alternatives for classical 8YSZ for TBC materials operating at ultrahigh temperatures.
Subjects
La (Zr − Ce ) O 2 1 x x 2 7
Mechanical properties
Oxygen-ion diffusivity
Thermal barrier coatings
Thermophysical properties
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