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Synthesis and Irradiation Behavior of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 High-entropy Pyrochlore Waste Forms Consolidated by Spark Plasma Sintering

文献类型：期刊论文

作者Ji, Xiaoyu4; Lei, Penghui4; Chen JH(陈嘉昊)4; Qiu, Jie4; Peng Q(彭庆)1,2,3; Yun, Di4
刊名VACUUM
出版日期2025-02-01
卷号232页码:7
关键词Nuclear waste form High-entropy pyrochlore Immobilization Ion irradiation Gas bubbles
ISSN号0042-207X
DOI10.1016/j.vacuum.2024.113893
通讯作者Lei, Penghui(penghuilei@xjtu.edu.cn) ; Qiu, Jie(qiu2021@xjtu.edu.cn)
英文摘要The development of spent fuel reprocessing, which generates large amounts of high-level waste, necessitates effective management of waste containing radioactive elements. Pyrochlore (A2B2O7) is considered one of the most promising immobilized matrixes for high-level waste due to its excellent physicochemical stability and irradiation resistance. A novel kind of high-entropy pyrochlore ceramic (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7, as an improved waste form matrix, was successfully synthesized using spark plasma sintering in this work. The mechanical properties, physical density, and microstructure of the densified pellets have been investigated in relation to different sintering temperatures (ranging from 1000 degrees C to 1400 degrees C). A single-component pyrochlore phase high-entropy ceramic was densified at 1300 degrees C, achieving a maximum hardness of 12.68 GPa and a density of 97.64 %. The irradiation tolerance of high-entropy pyrochlore was assessed by ion irradiation of 400 keV He+ with 10 x 1017 ions/cm2 at room temperature (RT). Ion irradiation can induce the transformation of the pyrochlore superlattice of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 into a fluorite sublattice. Compared to Gd2Ti2O7, (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 exhibits significantly reduced irradiation damage with suppressed generation and coalescence of helium bubbles due to chemical disorder and lattice distortion. High-entropy pyrochlore (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 exhibits superior mechanical properties and irradiation resistance, suggesting its application as a promising immobilization matrix for nuclear waste.
分类号二类
WOS关键词RADIATION STABILITY ; NUCLEAR ; IMMOBILIZATION ; PLUTONIUM ; CERAMICS ; VITRIFICATION ; PRODUCT
资助项目National Natural Science Foundation of China[12272378] ; Basic Scientific Research Fund of Xi'an Jiaotong University[xzy012022077] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0620103] ; High-level Innovation Research Institute Program of Guangdong Province[2020B0909010003]
WOS研究方向Materials Science ; Physics
语种英语
WOS记录号WOS:001370896000001
资助机构National Natural Science Foundation of China ; Basic Scientific Research Fund of Xi'an Jiaotong University ; Strategic Priority Research Program of the Chinese Academy of Sciences ; High-level Innovation Research Institute Program of Guangdong Province
其他责任者Lei, Penghui ; Qiu, Jie
源URL[http://dspace.imech.ac.cn/handle/311007/97735]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Guangdong Aerosp Res Acad, Guangzhou 511458, Peoples R China
2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
4.Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Xian 710049, Peoples R China;
推荐引用方式
GB/T 7714		 Ji, Xiaoyu,Lei, Penghui,Chen JH,et al. Synthesis and Irradiation Behavior of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 High-entropy Pyrochlore Waste Forms Consolidated by Spark Plasma Sintering[J]. VACUUM,2025,232:7.
APA Ji, Xiaoyu,Lei, Penghui,陈嘉昊,Qiu, Jie,彭庆,&Yun, Di.(2025).Synthesis and Irradiation Behavior of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 High-entropy Pyrochlore Waste Forms Consolidated by Spark Plasma Sintering.VACUUM,232,7.
MLA Ji, Xiaoyu,et al."Synthesis and Irradiation Behavior of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 High-entropy Pyrochlore Waste Forms Consolidated by Spark Plasma Sintering".VACUUM 232(2025):7.

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来源：力学研究所

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