A series of rare earth zirconates (RE₂Zr₂O₇) high-entropy ceramics with single- and dual-phase structure were prepared. Compared with La₂Zr₂O₇ and Yb₂Zr₂O₇, the smaller “rattling” ions (Yb³⁺, Er³⁺, Y³⁺) have been incorporated into pyrochlore lattice in (La_0.2Nd_0.2Y_0.2Er_0.2Yb_0.2)₂Zr₂O₇ (LNYEY) while larger ions (La³⁺, Nd³⁺, Sm³⁺, Eu³⁺) incorporated into fluorite lattice in (La_0.2Nd_0.2Sm_0.2Gd_0.2Yb_0.2)₂Zr₂O₇ (LNSGY). Due to high-entropy lattice distortion and resonant scattering derived from smaller ions Yb³⁺, Er³⁺, and Y³⁺, LNYEY shows a lower glass-like thermal conductivity (1.62-1.59 W m^-1 K^-1, 100-600℃) than LNSGY (1.74-1.75 W m^-1 K^-1, 100-600℃). Moreover, LNYEY and LNSGY exhibit enhanced Vickers’ hardness (LNYEY, H_v = 11.47 ± 0.41 GPa; LNSGY, H_v = 10.96 ± 0.26 GPa) and thermal expansion coefficients (LNYEY, 10.45 × 10^-6 K^-1, 1000℃; LNSGY, 11.02 × 10^-6 K^-1, 1000℃). These results indicate that dual-phase rare-earth-zirconate high-entropy ceramics could be desirable for thermal barrier coatings.

制备了一系列具有单相和双相结构的稀土锆酸盐（RE ₂ Zr ₂ O ₇）高熵陶瓷。与La ₂ Zr ₂ O ₇和Yb ₂ Zr ₂ O _7相比，较小的“棘手”离子（Yb ³⁺，Er ³⁺，Y ³⁺）已被引入到（La _0.2 Nd _0.2 Y _0.2 Er _0.2 Yb _0.2）₂ Zr ₂ O ₇（LNYEY）而较大离子（La在（La _0.2 Nd _0.2 Sm _0.2 Gd _0.2 Yb _0.2）₂ Zr ₂ O ₇（LNSGY）中掺入萤石晶格中的³⁺，Nd ³⁺，Sm ³⁺，Eu ³⁺）。由于高熵晶格畸变，并从较小的离子镱衍生共振散射³⁺，铒³⁺和Y ³⁺，LNYEY示出了下玻璃样的导热率（1.62-1.59脉冲W M ^-1 ķ ^-1，100- 600 L）比LNSGY（1.74-1.75 W m ^-1 K ^-1，100-600℃）。此外，LNYEY和LNSGY表现出增强的维氏硬度（LNYEY，ħ _v = 11.47±0.41 GPA; LNSGY，ħ _v = 10.96±0.26 GPa）的和热膨胀系数（LNYEY，10.45×10 ^-6 ķ ^-1，1000℃; LNSGY，11.02×10 ^-6 ķ ^-1，1000℃）。这些结果表明，双相稀土-锆酸盐高熵陶瓷可能是理想的隔热涂层。