High-entropy (Sm0.2Eu0.2Gd0.2Dy0.2Er0.2)2Hf2O7 ceramic with superb resistance to radiation-induced amorphization

doi:10.1016/j.jmst.2023.01.024

J. Mater. Sci. Technol. ›› 2023, Vol. 155: 1-9.DOI: 10.1016/j.jmst.2023.01.024

High-entropy (Sm_0.2Eu_0.2Gd_0.2Dy_0.2Er_0.2)₂Hf₂O₇ ceramic with superb resistance to radiation-induced amorphization

Jingxin Wu^a,b,c,d,e, Meng Zhang^c,d,e, Zhanqiang Li^c,d,e, Minzhong Huang^c,d,e, Huiming Xiang^f, Liyan Xue^c,d,e, Zhengming Jiang^c,d, Zhigang Zhao^a,b,c,d, Lianfeng Wei^g, Yong Zheng^g, Fan Yang^a,b,c,d,h,*, Guang Ran^i,*, Yanchun Zhou^j,*, Heng Chen^c,d,*

^aSchool of Rare Earths, University of Science and Technology of China, Hefei 230026, China;
^bGanjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;
^cXiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, China;
^dFujian Province Joint Innovation Key Laboratory of Fuel and Materials in Clean Nuclear Energy System, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;
^eFujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China;
^fScience and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;
^gThe Key Nuclear Fuel and Nuclear Materials Laboratory of China, Nuclear Power Institute of China, Chengdu 610213, China;
^hChina Rare Earth Group Co., Ltd., Chengdu 610213, China;
ⁱCollege of Energy, Xiamen University, Xiamen 361102, China;
^jSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

Received:2022-11-06 Revised:2022-12-27 Accepted:2023-01-02 Published:2023-08-20 Online:2023-03-12
Contact: *E-mail addresses: fanyang2013@fjirsm.ac.cn (F. Yang), gran@xmu.edu.cn (G. Ran), yczhou@alum.imr.ac.cn (Y. Zhou), xmchenheng@fjirsm.ac.cn (H. Chen).

Abstract

Abstract: Nuclear engineering materials are required to possess outstanding extreme environmental tolerance and irradiation resistance. A promising novel pyrochlore-type of (Sm_0.2Eu_0.2Gd_0.2Dy_0.2Er_0.2)₂Hf₂O₇ high-entropy ceramic (HE-RE₂Hf₂O₇) for control rod was prepared by solid-state reaction method. The ion irradiation of HE-RE₂Hf₂O₇ with 400 keV Kr⁺ at 400 °C was investigated using a 400 kV ion implanter and compared with single-component pyrochlore Gd₂Hf₂O₇ to evaluate the irradiation resistance. For HE-RE₂Hf₂O₇, the phase transition from pyrochlore to defective fluorite is revealed after irradiation at 60 dpa. After irradiation at 120 dpa, it maintained crystalline, which is comparable to Gd₂Hf₂O₇ but superior to the titanate pyrochlores previously studied. Moreover, the lattice expansion of HE-RE₂Hf₂O₇ (0.22%) is much lower than that of Gd₂Hf₂O₇ (0.62%), indicating excellent irradiation damage resistance. Nanoindentation tests displayed an irradiation-induced increase in hardness and a decrease in elastic modulus by about 2.6%. Irradiation-induced segregation of elements is observed on the surface of irradiated samples. In addition, HE-RE₂Hf₂O₇ demonstrates a more sluggish grain growth rate than Gd₂Hf₂O₇ at 1200 °C, suggesting better high-temperature stability. The linear thermal expansion coefficient of HE-RE₂Hf₂O₇ is 10.7 × 10^-6 K^-1 at 298-1273 K. In general, it provides a new strategy for the design of the next advanced nuclear engineering materials.

Key words: High-entropy ceramic, Rare earth hafnate, Ion irradiation, Amorphization resistance, High temperature stability, Nuclear safety

Jingxin Wu, Meng Zhang, Zhanqiang Li, Minzhong Huang, Huiming Xiang, Liyan Xue, Zhengming Jiang, Zhigang Zhao, Lianfeng Wei, Yong Zheng, Fan Yang, Guang Ran, Yanchun Zhou, Heng Chen. High-entropy (Sm_0.2Eu_0.2Gd_0.2Dy_0.2Er_0.2)₂Hf₂O₇ ceramic with superb resistance to radiation-induced amorphization[J]. J. Mater. Sci. Technol., 2023, 155: 1-9.

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High-entropy (Sm_0.2Eu_0.2Gd_0.2Dy_0.2Er_0.2)₂Hf₂O₇ ceramic with superb resistance to radiation-induced amorphization

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