Abstract Single crystals of strontium iodide (SrI 2 ), an important material for nuclear detector applications, are grown commercially in cylindrical ampoules using the Bridgman self-seeding method. As a result, the axial orientation of Bridgman boules varies from run to run. Most crystal growth methods benefit from the use of oriented seeds, which can be helpful in maximizing growth rates and crystal quality. However, it is very difficult to orient SrI 2 crystals because they are deliquescent and their surfaces damage easily during cutting and polishing. In this study, unpolished facets formed on an edge-defined film-fed growth (EFG) boule were used to generate the first Laue patterns. The principal boule used in this study had a square cross section and was grown using a seed cut from along the growth axis of a Bridgman boule. X-ray analysis showed that the EFG boule grown from this seed grew along the b-axis and the side facets were the (1 0 0) and (0 0 1) faces. This work made possible the fabrication of oriented SrI 2 seeds for use in future EFG and Czochralski growth experiments and allowed for the determination of the optic axes using polarized light.

中文翻译：

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SrI 2 晶体晶体取向的测定

摘要 碘化锶 (SrI 2 ) 单晶是用于核探测器应用的重要材料，使用布里奇曼自种法在圆柱形安瓿中商业化生长。因此，布里奇曼晶锭的轴向取向因运行而异。大多数晶体生长方法受益于定向晶种的使用，这有助于最大化生长速率和晶体质量。然而，SrI 2 晶体的取向非常困难，因为它们易潮解并且在切割和抛光过程中容易损坏它们的表面。在这项研究中，在边缘定义的薄膜馈送生长 (EFG) 晶锭上形成的未抛光面被用于生成第一个劳厄图案。本研究中使用的主要晶锭具有方形横截面，并使用沿 Bridgman 晶锭的生长轴切下的种子生长。X 射线分析表明，从该种子生长的 EFG 晶锭沿 b 轴生长，侧面是 (1 0 0) 和 (0 0 1) 面。这项工作使制造用于未来 EFG 和直拉生长实验的定向 SrI 2 种子成为可能，并允许使用偏振光确定光轴。