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

doi:10.1016/j.vacuum.2024.113893

IMECH-IR > 非线性力学国家重点实验室

	Synthesis and Irradiation Behavior of (Gd0.2Sm0.2Dy0.2Er0.2Yb0.2)2Ti2O7 High-entropy Pyrochlore Waste Forms Consolidated by Spark Plasma Sintering
	Ji, Xiaoyu 1; Lei, Penghui 1; Chen JH(陈嘉昊)1; Qiu, Jie 1; Peng Q(彭庆)2,3,4; Yun, Di 1
通讯作者	Lei, Penghui([email protected]) ; Qiu, Jie([email protected])
发表期刊	VACUUM
	2025-02-01
卷号	232 页码:7
ISSN	0042-207X
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.
关键词	Nuclear waste form High-entropy pyrochlore Immobilization Ion irradiation Gas bubbles
DOI	10.1016/j.vacuum.2024.113893
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001370896000001
关键词[WOS]	RADIATION STABILITY ; NUCLEAR ; IMMOBILIZATION ; PLUTONIUM ; CERAMICS ; VITRIFICATION ; PRODUCT
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
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]
项目资助者	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
论文分区	二类
力学所作者排名	3+
RpAuthor	Lei, Penghui ; Qiu, Jie
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/97736
专题	非线性力学国家重点实验室
作者单位	1.Xi An Jiao Tong Univ, Sch Nucl Sci & Technol, Xian 710049, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; 4.Guangdong Aerosp Res Acad, Guangzhou 511458, 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.Rp_Au:Lei, Penghui, Qiu, Jie
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.