In this study, a novel high-entropy oxide of (La_1/6Nd_1/6Yb_1/6Y_1/6Sm_1/6Lu_1/6)₂Ce₂O₇was prepared using a sol–gel and high-temperature sintering technology. Additionally, its lattice structure, micro-morphology, elemental composition, and thermophysical and mechanical properties were evaluated. The results revealed that the obtained oxide powder has a typical fluorite-type lattice with particle sizes in the range of∼30–100 nm. The bulk sample has a dense microstructure and uniform elemental distribution. Owing to its low lattice order, the thermal expansion coefficient of (La_1/6Nd_1/6Yb_1/6Y_1/6Sm_1/6Lu_1/6)₂Ce₂O₇ is greater than that of Sm₂Ce₂O₇, which also exhibits excellent lattice stability up to 1200 °C. Further, owing to phonon scattering due to lattice distortion, oxygen vacancy, and cation substitution, the thermal conductivity of (La_1/6Nd_1/6Yb_1/6Y_1/6Sm_1/6Lu_1/6)₂Ce₂O₇ is lower than that of Sm₂Ce₂O₇, while its mechanical performance is inferior to that of 7YSZ.

在这项研究中，使用溶胶-凝胶制备了一种新型的高熵氧化物 (La _1/6 Nd _1/6 Yb _1/6 Y _1/6 Sm _1/6 Lu _1/6 ) ₂ Ce ₂ O ₇和高温烧结技术。此外，还对其晶格结构、微观形态、元素组成以及热物理和机械性能进行了评估。结果表明，所获得的氧化物粉末具有典型的萤石型晶格，粒径范围为~30-100 nm。大块样品具有致密的微观结构和均匀的元素分布。由于其低晶格有序，(La _1/6 Nd_1/6 Yb _1/6 Y _1/6 Sm _1/6 Lu _1/6 ) ₂ Ce ₂ O ₇比Sm ₂ Ce ₂ O _{7 大}，在高达1200°C时也表现出优异的晶格稳定性。此外，由于晶格畸变、氧空位和阳离子取代引起的声子散射，(La _1/6 Nd _1/6 Yb _1/6 Y _1/6 Sm _1/6 Lu _1/6 ) ₂ Ce的热导率₂ O ₇低于Sm ₂Ce ₂ O ₇，而其力学性能不如7YSZ。