Effects of irradiation temperature on the response of CeO2, ThO2, and UO2 to highly ionizing radiation
Effects of irradiation temperature on the response of CeO2, ThO2, and UO2 to highly ionizing radiation
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辐照温度对CeO2、ThO2和UO2高电离辐射响应的影响
DOI：
10.1016/j.jnucmat.2019.07.029
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发表时间：
2019
影响因子：
3.1
通讯作者：
M. Lang
中科院分区：
文献类型：
--
作者：
W. Cureton;R. Palomares;C. Tracy;Eric C. O’Quinn;J. Walters;M. Zdorovets;R. Ewing;M. Toulemonde;M. Lang
用198 MeV 132 ~（132）Ar ~+离子在25 °C ~ 700 °C范围内以相同的能量密度辐照微晶CeO 2、ThO 2和UO 2，然后用同步辐射X射线衍射和X射线吸收光谱对其进行表征。在1.5 × 1013 ions/cm 2的能量密度下，所有样品均保持结晶度和标称萤石型相。CeO 2和ThO 2在室温下辐照后均表现出缺陷诱导的晶胞膨胀（分别为0.15%和0.10%），但随着辐照温度的升高，产生的最大膨胀减小至0.02%。或者，UO 2在室温照射下显示出晶胞参数的初始收缩（约-0.05%），这很可能与照射增强的退火或照射诱导的氧化有关。在较高的温度下（200 °C以上），UO 2开始膨胀，超过辐照前的晶胞参数（约0.05%），这种效应可能是由于真空中铀氧化态的轻微降低。然而，虽然CeO 2在室温下照射进行部分还原，UO 2和ThO 2表现出阳离子氧化态没有可测量的变化，证明了X射线吸收光谱。所有的样品显示出减少辐射引起的非均匀的微观应变作为增加的辐射温度的函数。
Microcrystalline CeO2, ThO2, and UO2were irradiated with 198 MeV132Xe ions to the same fluence at temperatures ranging from 25 °C to 700 °C then characterized by synchrotron X-ray diffraction and X-ray absorption spectroscopy. All samples retain crystallinity and their nominal fluorite-type phase at a fluence of 1.5 × 1013ions/cm2. Both CeO2and ThO2display defect-induced unit cell expansion after irradiation at room temperature (∼0.15% and ∼0.10%, respectively), yet as irradiation temperature increases, the maximum swelling produced decreases to ∼0.02%. Alternatively, UO2shows an initial contraction in unit cell parameter (approximately −0.05%) for room temperature irradiation, most likely related to irradiation-enhanced annealing or irradiation-induced oxidation. At higher temperatures (above 200 °C) UO2begins to swell, surpassing its unit cell parameter prior to irradiation (∼0.05%), an effect which could be attributed to minor reduction in uranium oxidation state in vacuum. However, while CeO2irradiated at room temperature undergoes partial reduction, both UO2and ThO2exhibit no measurable change in cation oxidation state as evidenced by X-ray absorption spectroscopy. All samples display a decrease in irradiation-induced heterogeneous microstrain as a function of increasing irradiation temperature.
DOI：
10.1016/0001-6160(53)90006-6
发表时间：
1953-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
WILLIAMSON, GK;HALL, WH
通讯作者：
HALL, WH