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Chin. Phys. B, 2017, Vol. 26(9): 097101    DOI: 10.1088/1674-1056/26/9/097101
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

First-principles study of helium clustering at initial stage in ThO2

Kuan Shao(邵宽)1,3, Han Han(韩晗)1, Wei Zhang(张伟)1,2, Chang-Ying Wang(王昌英)1, Yong-Liang Guo(郭永亮)1, Cui-Lan Ren(任翠兰)1,2, Ping Huai(怀平)1,2
1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
2 Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  The clustering behavior of helium atoms in thorium dioxide has been investigated by first-principles calculations. The results show that He atoms tend to form a cluster around an octahedral interstitial site (OIS). As the concentration of He atoms in ThO2 increases, the strain induced by the He atoms increases and the octahedral interstitial site is not large enough to accommodate a large cluster, such as a He hexamer. We considered three different Schottky defect (SD) configurations (SD1, SD2, and SD3). When He atoms are located in the SD sites, the strain induced by the He atoms is released and the incorporation and binding energies decrease. The He trimer is the most stable cluster in SD1. Large He clusters, such as a He hexamer, are also stable in the SDs.
Keywords:  first-principles study      thorium dioxide      helium cluster      defective properties  
Received:  31 March 2017      Revised:  18 May 2017      Accepted manuscript online: 
PACS:  71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)  
  61.72.-y (Defects and impurities in crystals; microstructure)  
  31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))  
  71.20.Ps (Other inorganic compounds)  
Fund: Project supported by the Program of International S&T Cooperation, China (Grant No. 2014DFG60230), the National Natural Science Foundation of China (Grant Nos. 11605273, 21571185, U1404111, 11504089, 21501189, and 21676291), the Shanghai Municipal Science and Technology Commission, China (Grant No. 16ZR1443100), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA02040104).
Corresponding Authors:  Han Han, Ping Huai     E-mail:  hanhan@sinap.ac.cn;huaiping@sinap.ac.cn

Cite this article: 

Kuan Shao(邵宽), Han Han(韩晗), Wei Zhang(张伟), Chang-Ying Wang(王昌英), Yong-Liang Guo(郭永亮), Cui-Lan Ren(任翠兰), Ping Huai(怀平) First-principles study of helium clustering at initial stage in ThO2 2017 Chin. Phys. B 26 097101

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