Abstract
ZrOCl2·8H2O, La2O3, Sm2O3, Dy2O3, and Gd2O3 powders were used as raw materials to prepare equimolar-ratio (Zr1/5La1/5Sm1/5Dy1/5Gd1/5)O2−x high-entropy ceramic materials via chemical co-precipitation method. Microstructure, phase structure, high-temperature stability, and evolution of phase composition of the powders under high-temperature conditions were studied. Results show that (Zr1/5La1/5Sm1/5Dy1/5Gd1/5)O2−x high-entropy ceramic materials synthesized via chemical co-precipitation method exhibited single cubic fluorite phase structure. After heat treatment at 1400 °C for 5 h, solid solution of monoclinic rare-earth oxide separated from cubic fluorite phase. Ceramic powders exhibited stable monoclinic phase and rare-earth oxide-doped ZrO2 dual phase after long-term heat treatment up to 100 h. Results of the fitting of x-ray spectroscopy data show that oxygen vacancy content in high-entropy ceramic powders decreased from 85 to 57% after 100 h of heat treatment. Results of thermogravimetry and differential scanning calorimetry measurements show that hydroxides in high-entropy ceramic powders underwent dehydration reactions at 273 and 454 °C, and the separation of rare-earth oxides from cubic solid solutions occurred when the temperature increased above 1320 °C.
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Dai, J., Yang, W., Mu, R. et al. Preparation and High-Temperature Stability of (Zr1/5La1/5Sm1/5Dy1/5Gd1/5)O2−x High-Entropy Ceramic Materials. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09573-6
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DOI: https://doi.org/10.1007/s11665-024-09573-6