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Abstract The medium-entropy oxide (Y1/3Yb1/3Lu1/3)2O3 with a body-centered cubic structure was successfully synthesized by solid-state reaction process, and then it was introduced into SiC ceramic to study its effect on… Click to show full abstract
Abstract The medium-entropy oxide (Y1/3Yb1/3Lu1/3)2O3 with a body-centered cubic structure was successfully synthesized by solid-state reaction process, and then it was introduced into SiC ceramic to study its effect on the oxidation behavior of SiC ceramic at 1700 °C. The (Y1/3Yb1/3Lu1/3)2O3-modified SiC ceramic exhibited better oxidation resistance than its individual oxides (Y2O3, Yb2O3, and Lu2O3) modified SiC ceramic. The experimental and calculated results all indicate that the rare-earth atoms had the tendency to diffuse into the SiO2 structure and occupy the interstitial positions within SiO2 structure. The introduction of medium-entropy oxide (Y1/3Yb1/3Lu1/3)2O3 reduced the initial oxidation rate of the ceramic samples (1−3 h), and enhanced the stability of SiO2 structure, thus resulting in a better oxidation resistance at 1700 °C.
Journal Title: Journal of The European Ceramic Society
Year Published: 2021
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