ABSTRACT Rare-earth cerium oxides (RE2Ce2O7, RE = rare-earth elements) are proposed as promising thermal barrier coatings (TBCs) material due to large thermal expansion coefficient (TEC), phase stability and a comparable thermal cycling life to Yttria-Stabilized Zirconia (YSZ). However, the thermal conductivity of RE2Ce2O7 is relatively higher than that of both YSZ and rare-earth zirconates. Here, we report an effective method of reducing the thermal conductivity of Yb2Ce2O7 by Zr-doping. It is shown that, due to the strong phonon scattering caused by mass and radius differences between Ce4+ and Zr4+ ions, and disorder introduced into structures, the thermal conductivity of solid solutions is remarkably reduced with the increasing of Zr4+ content. Considering the high TEC, the Zr-doped Yb2Ce2O7 solid solutions are believed to be promising candidate materials for TBCs at elevated temperature.

中文翻译：

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通过锆掺杂用于热障涂层提高氧化镱铈的热性能

摘要 稀土铈氧化物（RE2Ce2O7，RE = 稀土元素）由于具有大的热膨胀系数 (TEC)、相稳定性和与氧化钇稳定的氧化锆相当的热循环寿命而被提议作为有前景的热障涂层 (TBC) 材料(YSZ)。然而，RE2Ce2O7 的热导率相对高于 YSZ 和稀土锆酸盐。在这里，我们报告了一种通过 Zr 掺杂降低 Yb2Ce2O7 热导率的有效方法。结果表明，由于Ce4+和Zr4+离子之间的质量和半径差异引起的强烈声子散射，以及结构中引入的无序，固溶体的热导率随着Zr4+含量的增加而显着降低。考虑到高 TEC，