CsI(Eu)晶体空间生长地面实验

人工晶体在高技术领域具有十分重要的应用.在多组分晶体生长过程中，由于分凝的存在，会导致成分沿晶体生长方向产生变化，从而影响到晶体性能的均匀性，对应用产生不利影响.为研究微重力对多组分晶体分凝的影响，利用天宫二号卫星进行空间晶体生长实验.结合晶体生长特性和天宫二号综合材料实验装置的技术条件，确定以铕掺杂CsI晶体为研究对象.在地面研制阶段，CsI（Eu）晶体样品顺利通过力学环模试验，并在地面实验中生长出质量较高的CsI晶体，样品中存在明显的组分分凝.

Ground Experiment of CsI(Eu) Single Crystal Space Growth

Single crystals play quite an important role in material applications. In the process of single crystals growth, ingredients of crystals vary along its growth orientation because of the segregation. Consequently, uniformity of the crystal may be affected, which add to the disadvantage of its application. In order to study the influence of microgravity on the segregation of multicomponent crystal, the crystal growth through the platform of Tiangong-2 is planned. Considering the growth properties and the condition of Tiangong-2, Eu2+ doped CsI is chosen as the study object. The inner structure of quartz ampoule is designed, which passes the vibration experiment successfully. Moreover, the high quality single crystal is grown in the laboratory, and the concentration segregation is found obviously in the specimen.