A new entropy-stabilized rare earth niobates (Re₃NbO₇, Re = Dy, Y, Ho, Er, Yb) system with disordered defective fluorite structure was prepared by solid-state method. XRD, Raman and EDS results confirmed the homogeneous distribution and equimolar doping of rare earth cations. High-entropy Re₃NbO₇ ceramics showed smaller grain size compared with single rare earth niobates owing to the sluggish grain diffusion. Due to the increased configuration entropy, (Dy_0.2Ho_0.2Er_0.2Y_0.2Yb_0.2)₃NbO₇ (5Re₃NbO₇) has enhanced mechanical properties (H_v = 9.51 GPa, K_ⅠC = 2.13 MPa m^0.5), a high thermal expansion coefficient (10.2 × 10^-6 K^-1, 1200℃) and ultra-low thermal conductivity (0.724 W m^-1 K^-1, 25℃). These results suggest that the material can be used as a new type of thermal barrier coatings as alternative to yttria-stabilized zirconia.

通过固相法制备了具有无序缺陷萤石结构的新型熵稳定稀土铌酸盐（Re ₃ NbO ₇，Re = Dy，Y，Ho，Er，Yb）体系。XRD，拉曼和EDS结果证实了稀土阳离子的均匀分布和等摩尔掺杂。与单稀土铌酸盐相比，高熵的Re ₃ NbO ₇陶瓷由于晶粒扩散缓慢而显示出较小的晶粒尺寸。由于配置熵增加，（Dy _0.2 Ho _0.2 Er _0.2 Y _0.2 Yb _0.2）₃ NbO ₇（5Re ₃ NbO ₇）具有增强的机械特性（ħ _v  = 9.51 GPA，ķ _ⅠC  = 2.13兆帕米^0.5），高的热膨胀系数（10.2×10 ^-6  ķ ^-1，1200℃）和超低热导率（0.724女男^{- 1}  K ^-1，25 ℃）。这些结果表明，该材料可用作氧化钇稳定的氧化锆的替代品的新型热障涂层。