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• W4313441745 endingPage "3102" @default.
• W4313441745 startingPage "3089" @default.
• W4313441745 abstract "Abstract Thermal barrier coatings (TBCs) play an important role in gas turbines to protect the turbine blades from the high‐temperature airflow damage. In this work, we use first‐principles calculations to investigate a specific class of rare‐earth ( RE ) aluminates, including cubic‐ RE AlO 3 (c‐ RE AlO 3 ), orthorhombic‐ RE AlO 3 (o‐ RE AlO 3 ), RE 3 Al 5 O 12 , and RE 4 Al 2 O 9 , to predict their structural stability, bonding characteristics, and mechanical and thermal properties. The polyhedron structures formed by the Al–O bonds are stronger and exhibit rigid characteristics, whereas the polyhedra formed by the RE –O bonds are relatively weak and soft. The alternating stacking of AlO 4 tetrahedra, AlO 6 octahedra, and RE –O polyhedra, as well as the selection of RE elements, shows intensive influences on the expected mechanical and thermal properties. The B , G , and E of these four types of aluminates decrease in the order of c‐ RE AlO 3 > o‐ RE AlO 3 > RE 3 Al 5 O 12 > RE 4 Al 2 O 9 . RE AlO 3 and RE 4 Al 2 O 9 are brittle and quasi‐ductile ceramics, respectively, whereas RE 3 Al 5 O 12 is tailorable. The minimum thermal conductivity is in the range of 1.4–1.5 W m −1 K −1 for c‐ RE AlO 3 , 1.3–1.4 W m −1 K −1 for o‐ RE AlO 3 , 1.25–1.35 W m −1 K −1 for RE 3 Al 5 O 12 , and 0.8–0.9 W m −1 K −1 for RE 4 Al 2 O 9 . RE 4 Al 2 O 9 with low thermal conductivity and damage tolerance is predicted to be the potential candidates for next‐generation TBC materials." @default.
• W4313441745 created "2023-01-06" @default.
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• W4313441745 date "2023-01-16" @default.
• W4313441745 modified "2023-10-17" @default.
• W4313441745 title "Screening rare‐earth aluminates as promising thermal barrier coatings by high‐throughput first‐principles calculations" @default.
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• W4313441745 doi "https://doi.org/10.1111/jace.18970" @default.
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