All-in-one high-entropy rare earth tantalates materials with superior thermal-and oxygen-barrier properties (IMAGE)

Tsinghua University Press

All-in-one high-entropy rare earth tantalates materials with superior thermal-and oxygen-barrier properties

Caption

The rare-earth tantalate with excellent oxygen and thermal insulation was synthesized via Spark Plasma Sintering. The high-entropy components (8RE1/8)TaO4 designed by large size disorder and mass disorder have been reassembled into a stabilized monoclinic structure. The lowed thermal conductivity for (8RE1/8)TaO4 benefits from strong scattering by the phonon–phonon, grain boundary, domain boundary, dislocation and vacancy defects. The lowed ionic conductivities for (8RE1/8)TaO4 originate from the fact that the strong Ta-O bonding strength, immobile oxygen vacancies and severe lattice distortions co-impede carrier transport. Moreover, (8RE1/8)TaO4 had superior high-temperature stability and excellent mechanical properties, demonstrating that (8RE1/8)TaO4 is a promising candidate for T/EBCs.

Credit

Journal of Advanced Ceramics, Tsinghua University Press

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