Thermal defect annealing of swift heavy ion irradiated ThO2

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:405

Article

Palomares, Raul I.¹  Tracy, Cameron L.²  Neuefeind, Joerg³  Ewing, Rodney C.²  Trautmann, Christina^4,5  Lang, Maik¹ 

[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;   

DOI  :  10.1016/j.nimb.2017.05.007

来源: Elsevier

【 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.

【 授权许可】

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