Pyrochlore-fluorite dual-phase high-entropy RE2(Ce0.2Zr0.2Hf0.2Sn0.2Ti0.2)2O7 (RE2HE2O7, RE = La, Nd, Sm, Eu, Gd, Dy) ceramics with glass-like thermal conductivity

被引：15
作者：
He, Junjie [1 ,2 ]
He, Guo [1 ,2 ]
Wang, Panpan [1 ,2 ]
Xu, Lurun [1 ,2 ]
Liu, Jing [1 ,2 ]
Tao, Jingchao [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE | 2022年 / 57卷 / 37期
关键词：
MECHANICAL-PROPERTIES; OXIDES; EVOLUTION; TOUGHNESS; PR; CE; LN;
D O I：
10.1007/s10853-022-07734-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, new high-entropy RE2(Ce0.2Zr0.2Hf0.2Sn0.2Ti0.2)(2)O-7 (RE2HE2O7, RE = La, Nd, Sm, Eu, Gd, Dy) ceramics were successfully prepared. RE2HE2O7 ceramics exhibited a pyrochlore-fluorite dual-phase structure. For Sm2HE2O7 ceramic, Ce4+ with larger ionic radius was enriched in the fluorite phase, Sn4+ and Ti4+ with smaller ionic radii were enriched in the pyrochlore phase, while Zr4+ and Hf4+ with medium ionic radii existed in both phases. Compared with YSZ materials, RE2HE2O7 ceramics exhibited a much lower glass-like thermal conductivity (1.19-1.68 W m(-1) K-1, 100-900 degrees C) and comparable thermal expansion coefficients (8.67-10.85 x 10(-6) K-1, 1200 degrees C). Furthermore, due to grain refinement caused by the competition of two phases, the Vickers hardness (10.29-13.85 GPa) of RE2HE2O7 ceramics is improved. The results indicate that dual-phase high-entropy RE2HE2O7 ceramics are promising candidate materials for the next generation of thermal barrier coatings.
引用
收藏
页码：17563 / 17576
页数：14
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