Burkhardt Ulrich, Winkelmann Aimo, Borrmann Horst, Dumitriu Andreea, König Markus, Cios Grzegorz, Grin Yuri
Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany.
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Kraków, Poland.
Sci Adv. 2021 May 14;7(20). doi: 10.1126/sciadv.abg0868. Print 2021 May.
The assignment of enantiomorphs by diffraction methods shows fundamental differences for x-rays and electrons. This is particularly evident for the chiral allotrope of β-Mn. While it is not possible to determine the sense of chirality of β-Mn with established x-ray diffraction methods, Kikuchi pattern simulation of the enantiomorphs reveals differences, if dynamical electron diffraction is considered. Quantitative comparison between experimental and simulated Kikuchi patterns allows the spatially resolved assignment of the enantiomorph in polycrystalline materials of β-Mn, as well as the structurally strongly related phase PtCuB. On the basis of enantiomorph distribution maps, crystals were extracted from enantiopure domains by micropreparation techniques. The x-ray diffraction analyses confirm the assignment of the Kikuchi pattern evaluations for PtCuB and do not allow to distinguish between the enantiomorphs of β-Mn.
通过衍射方法对映体的测定显示出X射线和电子存在根本差异。这在β-Mn的手性同素异形体中尤为明显。虽然用已有的X射线衍射方法无法确定β-Mn的手性方向，但如果考虑动态电子衍射，对映体的菊池线图案模拟会显示出差异。实验和模拟菊池线图案之间的定量比较使得在β-Mn多晶材料以及结构密切相关的相PtCuB中能够对映体进行空间分辨测定。基于对映体分布图，通过微制备技术从对映体纯的区域中提取晶体。X射线衍射分析证实了对PtCuB菊池线图案评估的测定结果，并且无法区分β-Mn的对映体。
