具有增强抗烧结性能的双相高熵锆酸盐 (La0.25Sm0.25Er0.25Ho0.25)2Zr2O7 用于热障涂层

Highly anti-sintering is critical for thermal barrier coatings operating under prolonged thermal exposure. Here, we report a dual-phase high-entropy zirconate, (La0.25Sm0.25Er0.25Ho0.25)2Zr2O7, with average grain size increasing only from 1.17 μm to 2.83 μm after heat treatment at 1600 {degree sign}C for 10-100 h, demonstrating outstanding high-temperature anti-sintering capability. Ab initio calculations reveal a clear surface energy trend that increasing with decreasing rare-earth ionic radius, with the (110) facet identified as the most stable. The bond-length and charge density analyses further uncover a pronounced disparity in lattice distortion between the coexisting phases, with markedly broader metal-oxygen bond distributions in the defect fluorite structure than in the pyrochlore counterpart. This strong structural heterogeneity, together with abundant pyrochlore and defect fluorite interfaces, suppresses grain coarsening and highlights dual-phase high-entropy design as an effective strategy for tuning materials sintering behavior.