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• W1971640909 abstract "Ultralow thermal conductivity (1.1 W/m.K, 1000 degrees C) in anion-deficient Ba2RAlO5 (R=Dy, Er, Yb) compounds was reported. The low thermal conductivity was then analyzed by kinetic theory. The highly defective structure of Ba2RAlO5 results in weak atomic bond strength and low sound speeds, and phonon scattering by large concentration of oxygen vacancies reduces the phonon mean free path to the order of interatomic distance. Ba2DyAlO5 exhibits the shortest phonon mean free path and lowest thermal conductivity among the three compositions investigated, which can be attributed to additional phonon scattering by DyO6 octahedron tilting as a result of a low tolerance factor. The Ba2RAlO5 (R=Dy, Er, Yb) compounds have shown great potential in high-temperature thermal insulation applications, particularly as a thermal barrier coating material." @default.
• W1971640909 created "2016-06-24" @default.
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• W1971640909 date "2008-08-22" @default.
• W1971640909 modified "2023-10-14" @default.
• W1971640909 title "Ultralow Thermal Conductivity in Highly Anion-Defective Aluminates" @default.
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• W1971640909 doi "https://doi.org/10.1103/physrevlett.101.085901" @default.
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