Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 6, Pages 8380-8386Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.12.044
Keywords
RE2Ce2O; High-entropy ceramics; Thermophysical properties; Lattice-stability
Categories
Funding
- Henan Province Science and Technology Research Plan Project [212102210181, 212102210032]
- National Nature Science Foundation of China [U2004182]
- Key scientific research projects of Henan Province [20A430007]
- Innovation and Entrepreneurship Training Program for College Students [202111517016]
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Two novel high-entropy ceramics, (La0.25Nd0.25Yb0.25Y0.25)(2)Ce2O7 and (La0.25Dy0.25Yb0.25Y0.25)(2)Ce2O7, were synthesized via a sol-gel technique and sintering at high temperatures. The obtained samples exhibit single fluorite lattice, dense microstructure, and uniform element distribution. Due to the high-entropy influence, the ceramics have lower thermal conductivities and higher thermal expansion coefficients compared to 7YSZ, while maintaining outstanding lattice stability at high temperatures.
Two novel high-entropy ceramics, (La0.25Nd0.25Yb0.25Y0.25)(2)Ce2O7 and (La0.25Dy0.25Yb0.25Y0.25)(2)Ce2O7, were synthesized via a sol-gel technique and sintering at high temperatures. The lattice type, micro-morphology, thermophysical performances and lattice stability of these two high-entropy ceramics were investigated. The results exhibit that the obtained bulk samples have single fluorite lattice, dense microstructure, and uniform element distribution. Owing to the high-entropy influence, the high-entropy oxides exhibit lower thermal conductivities than 7YSZ, and the thermal conductivity of (La0.25Dy0.25Yb0.25Y0.25)(2)Ce2O7 is lower than that of (La0.25Nd0.25Yb0.25Y0.25)(2)Ce2O7. Because of the less ionic size of Dy3+ than that of Nd3+, the thermal expansion coefficient of (La0.25Nd0.25Yb0.25Y0.25)(2)Ce2O7 is higher than that of (La0.25Dy0.25Yb0.25Y0.25)(2)Ce2O7. Their thermal expansion coefficients are higher than that of 7YSZ, and these two novel high-entropy oxides also exhibit outstanding lattice stability up to 1200 degrees C.
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