Thermal defect annealing of swift heavy ion irradiated ThO2

被引:5
|
作者
Palomares, Raul I. [1 ]
Tracy, Cameron L. [2 ]
Neuefeind, Joerg [3 ]
Ewing, Rodney C. [2 ]
Trautmann, Christina [4 ,5 ]
Lang, Maik [1 ]
机构
[1] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA
[2] Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA
[3] Oak Ridge Natl Lab, Spallat Neutron Source, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA
[4] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany
[5] Tech Univ Darmstadt, D-64287 Darmstadt, Germany
关键词
ThO2; Swift heavy ions; Defects; Neutron total scattering; Raman spectroscopy; Annealing; ALPHA-IRRADIATION; POINT-DEFECTS; OXYGEN; DAMAGE; CEO2; UO2; RECOVERY; DIOXIDE; CENTERS; OXIDES;
D O I
10.1016/j.nimb.2017.05.007
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Isochronal annealing, neutron total scattering, and Raman spectroscopy were used to characterize the structural recovery of polycrystalline ThO2 irradiated with 2-GeV Au ions to a fluence of 1 x 10(13) ions/cm(2). Neutron diffraction patterns show that the Bragg signal-to-noise ratio increases and the unit cell parameter decreases as a function of isochronal annealing temperature, with the latter reaching its pre-irradiation value by 750 degrees C. Diffuse neutron scattering and Raman spectroscopy measurements indicate that an isochronal annealing event occurs between 275-425 degrees C. This feature is attributed to the annihilation of oxygen point defects and small oxygen defect clusters. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:15 / 21
页数:7
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