Thermochemical investigations of phase formation processes of elements and compounds of group 15 and 16 in ionic liquid based synthesis - Mechanism of dissolution, structure formation and precipitation

在这个项目中，可以为离子液体中反应的物理化学研究以及合成混合物的热稳定性和产品（低温材料）的热力学性质的确定做出重大贡献。基本模型系统的系统调查和新材料合成的发展，在系统中包含15和16组元素的期望。因此，化学研究的重点是在低温合成中区分元素同素异素，在均匀性范围内定向合成组成明确的15和16族化合物，以及制备铋基层化合物。此外，目的是形成同原子和杂原子多阳离子化合物与IL通量组分的掺入。利用反应量热法、光谱法和动态扫描量热法（DSC）可以实现对溶解、相形成和沉淀机理的研究。为了理解室温以上合成的反应途径，我们研究了离子液体热分解产物及其通量体系的热行为和反应性。热力学标准数据的确定允许使用calphad方法进行建模，从而能够对各自化学系统的反应途径和相关系进行全面的热力学描述。

Within this project, significant contributions can be made for physico-chemical investigation of reactions in ionic liquids as well as for determination of thermal stability of syntheses mixtures and thermodynamic properties of products (low temperature materials). The methodical investigation of basic model systems and the development of new materials syntheses in systems containing elements of groups 15 and 16 is aspired. Thereby, the chemical focus is set on differentiation of element allotropes in low temperature synthesis, the directed synthesis of compounds of groups 15 and 16 with defined composition within the homogeneity range, and preparation of Bismuth-based layer compounds. Additionally, the formation of homoatomic and heteroatomic poly-cationic compounds with incorporation of IL flux components is aimed.Studies on the mechanism of dissolution, phase formation, and precipitation can be realized using reaction calorimetry, spectroscopy, and dynamic scanning calorimetry (DSC). For comprehension of reaction pathways of syntheses above room temperature the thermal behavior and the reactivity of products of thermal decomposition of ionic liquids and their flux systems is to involve in our investigations. The determination of thermodynamic standard data allows modeling using CalPhaD-methods and thus enables a comprehensive thermodynamic description of reaction pathways and phase relations of the respective chemical systems.