论文标题
研究氧化铀铣削以获得纳米结构的UCX靶
Study of uranium oxide milling in order to obtain nanostructured UCx target
论文作者
论文摘要
在中音设施中开发了一个研发计划，以尽可能强烈地提供新的富含中子中子核的光束。在欧洲项目的框架中，已经表明，使用纳米结构的难治性靶标的使用使我们能够在迄今为止获得核的光束。在处理中要控制的第一个参数以均匀的纳米结构获得目标是二氧化铀的研磨，低至100 nm晶粒尺寸。在这项研究中，研究了干燥和湿的磨途径，并根据相位稳定，特定的表面积和谷物形态分析粉末。看来磨削以及湿的干燥，导致粒径的减小。无论磨削如何，都可以观察到UO2的氧化。然而，干磨是最有效的，导致UO2氧化为U4O9和U3O7，其数量随磨的时间而增加，而晶体尺寸降低。
A R&D program is developed at the ALTO facility to provide new beams of exotic neutron-rich nuclei, as intense as possible. In the framework of European projects, it has been shown that the use of refractory targets with nanometric structure allows us to obtain beams of nuclei unreachable until now. The first parameter to be controlled in the processing to obtain targets with a homogeneous nanostructure is the grinding of uranium dioxide, down to 100 nm grain size. In this study, dry and wet grinding routes are studied and the powders are analyzed in terms of phase stabilization, specific surface area and grain morphology. It appears that the grinding, as well dry as wet, leads to the decrease of the particle size. The oxidation of UO2 is observed whatever the grinding. However, the dry grinding is the most efficient and leads to the oxidation of UO2 into U4O9 and U3O7 whose quantities increase with the grinding time while crystallite sizes decrease.
