摘要
Inspired by the concept of entropy stabilization, a series of rare-earth-zirconate medium-entropy ceramics were designed. The influence of size disorder parameter on the mechanical and thermophysical properties of rare-earth-zirconate medium-entropy ceramics was investigated. The results show that the prepared rare-earth-zirconate medium-entropy ceramics exhibit single pyrochlore structure, and the lattice constant is linearly related to the average doped rare-earth ionic radius. The scanning electron microscope-energy-dispersive spectroscopy results indicate the uniform distribution of doped rare-earth elements. The rare-earth-zirconate medium-entropy ceramics have relative density above 98.1% with high mechanical properties (HV ∼ 10.0 GPa, KⅠ ∼ 2.50 MPa m0.5, and E0 ∼ 220 GPa). (La1/3Eu1/3Gd1/3)2Zr2O7 medium-entropy ceramics with a larger (Formula presented.) (4.36%) present relatively high thermal expansion coefficients (10.93 ×310−6 K−1, 1200°C) and low thermal conductivity (1.57–1.58 W/(m K), 100–500°C). These results suggest that the prepared rare-earth-zirconate medium-entropy ceramics can be used as a new type of thermal insulation materials.
源语言 | 英语 |
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页(从-至) | 2037-2048 |
页数 | 12 |
期刊 | Journal of the American Ceramic Society |
卷 | 106 |
期 | 3 |
DOI | |
出版状态 | 已出版 - 3月 2023 |