Perovskites are widely known for their enormous possibility of elemental substitution, which leads to a large variety of physical properties. Hybrid perovskites such as CH₃NH₃PbI₃ (MAPbI₃) and CH₃NH₃PbCl₃ (MAPbCl₃) are perovskites with an A^[XII]B^[VI]X^[II]₃‐structure, where A is an organic molecule, B is a lead(II) cation and X is a halide anion of iodine or chlorine. Whereas MAPbCl₃ crystallizes in the cubic space group , MAPbI₃ is in the tetragonal space group I4/mcm. The substitution of I by Cl leads to an increased tolerance against humidity but is challenging or even impossible due to their large difference in ionic radii. Here, the influence of an increasing Cl content in the reaction solution on the miscibility of the solid solution members is examined systematically. Powders were synthesized by two different routes depending on the I:Cl ratio. High‐resolution synchrotron X‐ray data are used to establish values for the limits of the miscibility gap which are 3.1 (1.1) mol% MAPbCl₃ in MAPI and 1.0 (1) mol% MAPbI₃ in MAPCl. The establishment of relations between average pseudo‐cubic lattice parameters for both phases allows a determination of the degree of substitution from the observed lattice parameters.

中文翻译：

---

测定甲基铵碘化铅/氯化物固溶体系列中的混溶间隙。

钙钛矿因其元素取代的巨大可能性而广为人知，这会导致多种物理性质。混合钙钛矿，例如CH ₃ NH ₃碘化铅₃（MAPbI ₃）和CH ₃ NH ₃ PBCL ₃（MAPbCl ₃）是具有钙钛矿甲^[XII]乙^[VI] X ^[II] ₃ -结构，其中阿是有机分子，B是铅（II）阳离子，X是碘或氯的卤化物阴离子。而MAPbCl ₃在立方空间群中结晶，MAPbI ₃在四边形空间群I 4 / mcm中。用Cl取代I导致增加的耐湿性，但是由于它们在离子半径上的巨大差异而具有挑战性甚至是不可能的。在此，系统地研究了反应溶液中Cl含量的增加对固溶体互溶性的影响。根据I：Cl的比例，通过两种不同的途径合成了粉末。高分辨率同步加速器X射线数据用于建立混溶间隙极限的值，即MAPI中的3.1（1.1）mol％MAPbCl ₃和1.0（1）mol％MAPbI ₃在MAPCl中。在两个阶段的平均伪三次晶格参数之间建立关系可以从观察到的晶格参数确定取代度。