A pyrochlore-structured La₂(Zr_0.2Ce_0.2Hf_0.2Sn_0.2Ti_0.2)₂O₇ high-entropy oxide was designed and synthesized, and its properties were tested. Traditional two-layer structured thermal barrier coatings (TBCs) with a La₂(Zr_0.2Ce_0.2Hf_0.2Sn_0.2Ti_0.2)₂O₇ top-coat were prepared by plasma spraying. A phase-pure defective-fluorite high-entropy-oxide top coat was thus obtained. The results confirmed the possibility of synthesizing pyrochlore-structured La₂(Zr_0.2Ce_0.2Hf_0.2Sn_0.2Ti_0.2)₂O₇. The material exhibited a low thermal conductivity, which increased with increasing temperature. The coefficient of thermal expansion (CTE) of La₂(Zr_0.2Ce_0.2Sn_0.2Hf_0.2Ti_0.2)₂O₇ ranged from 7.55 × 10⁻⁶ °C⁻¹ to 8.63 × 10⁻⁶ °C⁻¹ for the corresponding range of room temperature to 1000 °C. After 10 thermal cycles at 1050 °C, the La₂(Zr_0.2Ce_0.2Hf_0.2Sn_0.2Ti_0.2)₂O₇ top coat spalled in the TBC. Spallation did not occur at the interface between the bond coat and the thermally grown oxide layer, while it is in the top coat near the bond coat. Owing to the low fracture toughness and low CTE, the thermal cycling lifetime of TBCs with the La₂(Zr_0.2Ce_0.2Hf_0.2Sn_0.2Ti_0.2)₂O₇ top coat was short.

设计合成了烧绿石结构的La ₂ (Zr _0.2 Ce _0.2 Hf _0.2 Sn _0.2 Ti _0.2 ) ₂ O ₇高熵氧化物，并对其性能进行了测试。具有 La ₂ (Zr _0.2 Ce _0.2 Hf _0.2 Sn _0.2 Ti _0.2 ) ₂ O _{7 的}传统两层结构热障涂层 (TBC)通过等离子喷涂制备面漆。由此获得相纯的缺陷萤石高熵氧化物顶涂层。结果证实了合成烧绿石结构的La ₂ (Zr _0.2 Ce _0.2 Hf _0.2 Sn _0.2 Ti _0.2 ) ₂ O ₇的可能性。该材料表现出低热导率，随温度升高而增加。La ₂ (Zr _0.2 Ce _0.2 Sn _0.2 Hf _0.2 Ti _0.2 ) ₂ O ₇的热膨胀系数 (CTE)范围为 7.55 × 10^-6  °C ^-1至 8.63 × 10 ^-6  °C ^-1对应于室温至 1000 °C 的范围。在 1050 °C 下进行 10 次热循环后，La ₂ (Zr _0.2 Ce _0.2 Hf _0.2 Sn _0.2 Ti _0.2 ) ₂ O ₇顶涂层在 TBC 中剥落。在粘合涂层和热生长的氧化物层之间的界面处没有发生散裂，而在粘合涂层附近的面涂层中发生散裂。由于低断裂韧性和低 CTE，含有 La ₂ (Zr _0.2 Ce _0.2 Hf _0.2Sn _0.2 Ti _0.2 ) ₂ O ₇面漆短。