微观结构
材料科学
热膨胀
晶体结构
萤石
热力学
熵(时间箭头)
格子(音乐)
标准摩尔熵
矿物学
分析化学(期刊)
结晶学
焓
复合材料
冶金
化学
物理
色谱法
声学
作者
Lilin Li,Bin Li,Sang Weiwei,Haoming Zhang,Xiaoge Chen,An Tang
标识
DOI:10.1016/j.ceramint.2021.12.054
摘要
A series of high-entropy oxides (La 0.25 Sm 0.25 Gd 0.25 Yb 0.25 ) 2 Ce 2+x O 7+2x were synthesised adopting a improved sol-gel technique and fritting method. The crystal-lattice, microstructure, elemental constitution, and thermal-physical performances were studied. The results showed that the synthesised high-entropy oxides have a single-fluorite lattice structure. The bulk specimen exhibits a compact microstructure, and clear grain boundaries. The thermal conductivities of the obtained high-entropy oxides are lower than those of CeO 2 and 7YSZ due to lattice strains and numerous oxygen vacancies. The obtained high-entropy oxides have greater thermal expansion coefficients than 7YSZ. The thermal conductivity and expansion coefficient are elevated because of the addition of excess CeO 2 . The synthesised high-entropy oxides also exhibit outstanding lattice steadiness up to 1200 °C.
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