Characterization of swift heavy ion irradiation damage in ceria
Characterization of swift heavy ion irradiation damage in ceria
复制标题
二氧化铈中快重离子辐照损伤的表征
DOI：
10.1557/jmr.2015.43
复制
发表时间：
2015
影响因子：
2.7
通讯作者：
T. Allen
中科院分区：
文献类型：
--
作者：
C. Yablinsky;R. Devanathan;J. Pakarinen;J. Gan;D. Severin;C. Trautmann;T. Allen
研究了快重离子辐照对UO_2燃料替代材料CeO_2的辐照损伤。微结构的变化导致的照射与940 MeV的金离子的42 keV/nm的电子能量损失的电子显微镜伴随着电子能量损失谱显示，存在一个小的密度降低的离子轨道核心的装置进行了研究。虽然不排除离子轨迹中的化学变化，但没有观察到它们的证据。经典分子动力学模拟的热峰在CeO_2中的能量沉积为12和36 keV/nm的显示损伤包括孤立的点缺陷在12 keV/nm，和缺陷团簇在36 keV/nm，没有非晶化在任何一个能量。推断得出的离子轨道和间隙循环的形成，阐明通过电子显微镜观察到的功能的快速重离子辐照氧化铈的密度变化的建模。
Swift heavy ion induced radiation damage is investigated for ceria (CeO_2), which serves as a UO_2 fuel surrogate. Microstructural changes resulting from an irradiation with 940 MeV gold ions of 42 keV/nm electronic energy loss are investigated by means of electron microscopy accompanied by electron energy loss spectroscopy showing that there exists a small density reduction in the ion track core. While chemical changes in the ion track are not precluded, evidence of them was not observed. Classical molecular dynamics simulations of thermal spikes in CeO_2 with an energy deposition of 12 and 36 keV/nm show damage consisting of isolated point defects at 12 keV/nm, and defect clusters at 36 keV/nm, with no amorphization at either energy. Inferences are drawn from modeling about density changes in the ion track and the formation of interstitial loops that shed light on features observed by electron microscopy of swift heavy ion irradiated ceria.