Abstract Solid state single crystal growth (SSCG) is a crystal growth technique where crystals are grown from a polycrystalline matrix. Here, we present single crystals of the iron pnictide LaFeAsO grown via SSCG using NaAs as a liquid phase to aid crystallization. The size of the as-grown crystals are up to 2 × 3 × 0.4 mm 3 . Typical for this method, but very uncommon for crystals of the pnictide superconductors and especially for the oxypnictides, the crystals show pronounced facets caused by considerable growth in c direction. The crystals were characterized regarding their composition, structure, magnetic, and thermodynamic properties. This sets the stage for further measurements for which single crystals are crucial such as any c axis and reciprocal space dependent measurements.

中文翻译：

---

三维多面LaFeAsO晶体的固态单晶生长

摘要 固态单晶生长 (SSCG) 是一种晶体生长技术，其中晶体由多晶基质生长。在这里，我们展示了使用 NaAs 作为液相通过 SSCG 生长的铁元素 LaFeAsO 的单晶以帮助结晶。生长晶体的尺寸高达 2 × 3 × 0.4 mm 3 。这种方法是典型的，但对于 pnictide 超导体的晶体非常不常见，特别是对于 oxypnictides，晶体显示出明显的小平面，这是由 c 方向的大量生长引起的。对晶体的组成、结构、磁性和热力学性质进行了表征。这为进一步测量奠定了基础，其中单晶至关重要，例如任何 c 轴和倒易空间相关测量。