Conveners
Structural Chemistry II
- Thorsten Gesing
If the compound of interested is liquid under ambient conditions, conventional crystallization methods are not able to deliver suitable crystals for X-ray diffraction. In situ capillary crystallization is used for the crystallization of enantiopure liquids to determine the absolute configuration. The main advantages of the method are that only a small sample amount (~5 mg) is required and...
The crystal chemistry of AIBIIXO4 (AI = Alkali ion, BII = alkali-earth ion, X = P, V, As) is very rich and has been widely investigated. We have been investigated the crystal structures of several compositions within the AIBIIVO4 series (X = V). In this contribution, we present the crystal structure, rich polymorphism and re-entrant phase transition of NaSrPO4 as investigated by in-situ powder...
β-Al4.5FeSi frequently occurs in recycled Al-Si alloys. Unsolved issues of the atomic structure obstructs its analysis in the materials. New crystal structures of β-Al4.5FeSi including polytype formation and ordering of Al and Si atoms are presented. Furthermore, the present study reconciles experimental results, own and from literature, additionally to evidence from DFT calculations to...
The effect of step-wise thermally induced annealing on the mechanical properties (i.e., E Modulus and hardness), as well as on the short range order, determined by Raman and photoluminescence spectroscopy, of radiation-damaged pyrochlore (A2B2X6Y) will be presented. While, the structural amorphization and subsequent reorganization process can be described by means of percolation theory, the...
In this work we shed the light on the mechanism of mesocrystals formation. We use the process of gamma-radiation induced synthesis of CeO2 mesocrystals as a model reaction, and perform time dependent studies using combination of different techniques including energy-filtered electron radial distribution function analysis and in-situ TEM. We follow the reaction from the very early stages...
