Orthorhombic to tetragonal polymorphic transformation of YTa3O9 and its inhibition through the design of high-entropy (Y0.2La0.2Ce0.2Nd0.2Gd0.2)Ta3O9

Hanwen Liu, Ling Liu*, Huimin Xiang, Fu Zhi Dai, Xiaohui Wang, Muzhang Huang, Chunlei Wan, Zhuang Ma, Yanbo Liu, Hezhang Li, Yanchun Zhou*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

10 引用 (Scopus)

摘要

To explore the mechanism of phase transformation, YTa3O9 was prepared by an integrated one-step synthesis and sintering method at 1500 °C using Y2O3 and Ta2O5 powders as starting materials. High-temperature XRD patterns and Raman spectra showed that a phase transformation from orthorhombic to tetragonal took place in YTa3O9 through the bond length and angle changes at 300–400 °C, which caused a thermal conductivity rise. To inhibit the phase transformation, a high-entropy (Y0.2La0.2Ce0.2Nd0.2Gd0.2)Ta3O9 (HE RETa3O9) was designed and synthesized at 1550 °C using the integrated solid-state synthesis and sintering method. In tetragonal structured HE RETa3O9, phase transformation was inhibited by the high-entropy effect. Furthermore, HE RETa3O9 exhibited low thermal conductivity, and its tendency to increase with temperature was alleviated (1.69 W/m·K, 1073 K). Good phase stability, low thermal conductivity and comparable fracture toughness to YSZ make HE RETa3O9 promising as a new thermal barrier coating material.

源语言英语
页(从-至)3559-3569
页数11
期刊Journal of the European Ceramic Society
42
8
DOI
出版状态已出版 - 7月 2022

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Liu, H., Liu, L., Xiang, H., Dai, F. Z., Wang, X., Huang, M., Wan, C., Ma, Z., Liu, Y., Li, H., & Zhou, Y. (2022). Orthorhombic to tetragonal polymorphic transformation of YTa3O9 and its inhibition through the design of high-entropy (Y0.2La0.2Ce0.2Nd0.2Gd0.2)Ta3O9. Journal of the European Ceramic Society, 42(8), 3559-3569. https://doi.org/10.1016/j.jeurceramsoc.2022.03.005