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• W4313429918 abstract "A₃BO₇-type (A = rare earth (RE), B = Nb or Ta) oxides have been studied as protective coating materials because of their low thermal conductivity; however, their hardness, toughness, and stiffness are insufficient, particularly for members with webeirte-type structures. In this work, we have synthesized two high-entropy oxides (HEOs) of weberite-type RE niobates/tantalates (RE₃Nb/TaO₇), i.e., (Nd_1/7Sm_1/7Eu_1/7Gd_1/7Dy_1/7Ho_1/7Er_1/7)₃NbO₇ (7HEOs-Nb) and (Nd_1/7Sm_1/7Eu_1/7Gd_1/7Dy_1/7Ho_1/7Er_1/7)₃(Nb_1/2Ta_1/2)O₇ (7HEOs-NbTa), to overcome the mechanical deficiencies. The short- and long-range ordered arrangements of RE cations in the A-site and Nb/Ta cations in the B-site were identified by the X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive spectrometry (EDS), and transmission electron microscopy. The enhancements in hardness (<i>H</i> = 9.4 GPa) and fracture toughness (<i>K</i>_IC = 2.0 MPa·m^1/2) were realized by grain refinement, solid solution strengthening, and high stiffness (<i>K</i>). The exceptional phase stability at 25−1500 ℃, amorphous thermal conductivity (<i>k</i> = 1.5−1.7 W·m⁻¹·K⁻¹ at 25−900 ℃), and high thermal expansion coefficients (TEC > 11.0×10⁻⁶ K⁻¹ at 1500 ℃) further supported their potential application as protective coating materials." @default.
• W4313429918 created "2023-01-06" @default.
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• W4313429918 date "2023-02-01" @default.
• W4313429918 modified "2023-10-18" @default.
• W4313429918 title "Mechanical property enhancements and amorphous thermal transports of ordered weberite-type RE ₃Nb/TaO ₇ high-entropy oxides" @default.
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• W4313429918 doi "https://doi.org/10.26599/jac.2023.9220693" @default.
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