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Preparation and High-Temperature Stability of (Zr1/5La1/5Sm1/5Dy1/5Gd1/5)O2−x High-Entropy Ceramic Materials

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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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Authors and Affiliations

  1. Key laboratory for advanced corrosion and protection of aviation materials, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, People’s Republic of China

    Jianwei Dai, Wenhui Yang, Rende Mu, Zaoyu Shen, He Tian & Limin He

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  1. Jianwei Dai
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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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