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- W4220769894 abstract "Materials with ultralow thermal conductivity and good thermal stability are of great interest in numerous applications such as energy storage and conversion devices, and thermal insulation components. In this work, a family of high-entropy Sm2B2O7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered cations on the B-site has been synthesized by introducing large atomic-size mismatch, mass and charge disorder. Through tuning the composition, the high-entropy Sm2B2O7 oxides can be engineered from pyrochlore to fluorite structure, accompanied with an order-disorder transition. The pyrochlore Sm2(Nb0.2Sn0.2Ti0.2Y0.2Zr0.2)2O7 and fluorite Sm2(Nb0.2Ta0.2Y0.2Yb0.2Zr0.2)2O7 exhibit low thermal conductivities of 1.35 W·m−1·K−1 and 1.23 W·m−1·K−1, respectively, indicating their good thermal insulation. In addition, the high-entropy fluorite Sm2(Nb0.2Ta0.2Y0.2Yb0.2Zr0.2)2O7 also shows average thermal expansion coefficient of 10.2 × 10−6 °C−1 and high-temperature stability even after thermal exposure at 1600 °C in air for 30 h. These results indicate that the high-entropy Sm2B2O7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) can be promising candidates for thermal barrier coatings and thermally insulators." @default.
- W4220769894 created "2022-04-03" @default.
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- W4220769894 date "2022-08-01" @default.
- W4220769894 modified "2023-10-14" @default.
- W4220769894 title "High-entropy Sm2B2O7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered B-site cations for ultralow thermal conductivity" @default.
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- W4220769894 doi "https://doi.org/10.1016/j.jmst.2021.12.038" @default.
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