Conveners
Solid State and Materials Chemistry I
- Oliver Oeckler (Leipzig University)
Crystalline magnesium stearate has been extensively used in pharmaceutical and other industries for decades. However, its crystal structure was not known. We present here the structure of the magnesium stearate trihydrate as determined from X-ray diffraction data of a micron-size single-crystal measured at a 4th generation synchrotron facility. Despite the small size of the single-crystals and...
In this study, we have investigated the influence of high-pressure on the structure of hydrous SiO2 glass by a combination of high-pressure Raman spectroscopy and X-ray Raman scattering (XRS) measurements. Previous data of anhydrous SiO2 glass serve as a reference. A detailed analysis of the SiO2 network of both compounds is provided. Moreover, we discuss the role of water in the glass...
High-entropy oxides (HEO) are a new class of materials containing five or more metal cations in a single-phase solid solution. For the first time, we show that high-entropy versions of mullite-type materials can be synthesized exemplarily shown in the form of 5 new compounds e.g. Bi2(AlGaFeMn)O9 and (Nd,Sm,Y,Er,Eu)2Mn4O10. The crystallized products as well as their formation are characterized...
Effects of Fe ↔ Al substitution on SFCA-I-type compounds with general formula A40O56 (A: Ca, Al, Fe3+, Fe2+) have been studied using single-crystal X-ray diffraction. The present investigation provides a detailed crystallographic analysis on the impact of chemical variations on a compound that is of relevance for the field of applied mineralogy related to the technologically important process...
We studied the structure of UO2 and its temperature dependence from 300 K to 20 K using synchrotron single crystal diffraction. Our samples were UO2 single crystals with a close stoichiometry, confirmed by Raman spectroscopy measurements. Anomalies in lattice parameters will be discussed as well as electron density measurements both above and below the magnetic phase transition, which is...
