Thermal spike response and irradiation-damage evolution of a defective YAlO3 crystal to electronic excitation

JOURNAL OF NUCLEAR MATERIALS

卷:499

Article

Liu, Yong¹  Huang, Qing²  Xue, Haizhou³  Crespillo, Miguel L.³  Liu, Peng¹ 

[1] Shandong Univ, Key Lab Particle Phys & Particle Irradiat MOE, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: Thermal spike response;    Damage evolution;    Defective crystal;    Electronic energy loss;   

DOI  :  10.1016/j.jnucmat.2017.11.052

来源: Elsevier

【 摘 要 】

Understanding the mechanism of ion-solid interactions and the responses of materials to energetic ion irradiation is fundamentally important to study the irradiation-damage behaviors and evaluate the irradiation-damage tolerances of functional materials working in artificial and natural radiation environments. In this work, an approach utilizing low-and high-energy ion irradiation is utilized to study the coupling effect between nuclear collision and electronic excitation related to an ion-irradiation-induced damage event. Microstructural analysis shows that, compared to the damage-free crystal, electronic excitation induces more considerable irradiation damage in the nuclear-collision-damaged crystal. Utilizing the inelastic thermal spike model, the evolution of the lattice temperature is calculated, revealing that, compared to the damage-free crystal, the local energy diffusion in the nuclear-collision-damaged crystal is suppressed and the irradiation-damage level is increased. This should be attributed to the decrease of the thermal conductivity and increase of the electron-phonon coupling in the nuclearcollision- damaged region. (C) 2017 Elsevier B.V. All rights reserved.

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