高能离子束辐照红外晶体的性能研究

With the rapid development of the infrared technologies, the infrared materials have wide applications in various extreme harsh environments, such as in the space exploration and nuclear reactor. However, under the irradiation of the cosmic rays and particles, the crystal lattice of these materials would be damaged and the physicochemical properties could change, which would significantly affect the safety and stability of the device operation and running. Thus, it is important to research the physical mechanism of the irradiation damage and performance change of the infrared materials in the harsh environment so as to solve the above-mentioned question. Based on the HIRFL-CSR facility in the National Laboratory of Heavy Ion Accelerator of Lanzhou, the main objective of this project is to study the lattice damage behavior, amorphous track formation, as well as the waveguide characteristics of the infrared crystals (SiC, ZnS, ZnSe etc.) irradiated by swift heavy ion through the microstructure characterization and spectral analysis techniques, and therefore develop a fundamental understanding of the radiation effects. Furthermore, combining with the molecular dynamics simulation, this work provides the underpinning science to discuss the influence of the latent ion track on the potential changes of the physicochemical properties of the infrared crystals working in the harsh space and reactor environments, as well as the formation mechanism of the waveguide structure, and finally the research under this project will lead to improvements in the understanding of the basic theory model for the swift heavy ion irradiation process.

红外技术极大的应用范围直接导致了红外材料将面对许多不同的极端工作条件，如面临宇宙射线辐照或反应堆应用的情况下，红外材料晶格结构会产生一定的损伤，这就需要掌握极端环境对红外光学材料物理和化学性质的影响和变化。本项目基于兰州重离子国家实验室的重离子加速器与冷却储存环装置，采用高能重离子辐照包括SiC、ZnS、ZnSe 等在内的红外晶体材料，对辐照稳定性的实验和理论模拟，研究辐照后材料的晶格损伤、非晶径迹、红外波段的波导特性。结合微观表征技术以及光谱分析技术等，研究其辐照效应。并结合离子辐照的分子动力学模拟，探究快重离子辐照形成的离子径迹，对于红外光学晶体性能进行调控，以及红外波段波导的制备分析探讨不同辐照条件下波导的结构和形成的机理，探究红外晶体材料在反应堆、宇宙射线等极端条件下物理化学性质可能的改变，进而完善用于解释快重离子辐照过程的理论模型。

采用高能重离子并结合中能离子辐照红外晶体、激光晶体等多种材料，对辐照稳定性的实验和理论模拟，研究辐照后晶体的晶格损伤、非晶径迹、红外波段的波导特性。并结合微观表征技术以及光谱分析技术等，研究其辐照效应。结合离子辐照的分子动力学模拟，对于光学晶体性能进行调控，研究了红外波段波导的制备条件，分析探讨了不同辐照条件下波导的结构和形成的机理，其研究结果对于红外、激光等晶体材料在反应堆、宇宙射线等极端条件下物理化学性质的性能演化提供了研究基础。.在项目执行期间共发表SCI收录论文13篇（该项目第一标注论文8篇，第二标注论文5篇），其中已经发表了12篇，接收在线1篇。项目组成员和研究生参加国际学术会议12人次，其中境外7人次，邀请海外专家访问2人次。毕业博士研究生2人，博士学位在读5人。完成了项目任务书中的研究目标。