A systematic exploration Method for the Development of metastable Metal Halides by Thermal Detection

该项目涉及一种新方法的开发和实际应用，该方法允许在一次测量中检测给定系统的整个系列金属卤化物化合物。在一般程序之后，富卤化物的金属卤化物（例如WCl 6）在逐渐加热下连续地与还原剂（例如金属粉末）反应。由于存在足够量的金属粉末并形成相应的金属卤化物，反应产物（例如在M-W-Cl体系中）在金属量增加而卤化物量减少的浓度梯度条件下连续形成。相应的反应步骤作为热（DTA或DSC）效应监测，并且产物通过XRD表征。这种方法的应用卤化物系统允许分配的形成反应，形成热的检测，和表征的化合物，其中大部分可以被认为是亚稳的。将对选定的化合物进行性质研究（例如磁性、电学或光学性质）。这些研究的结果有望回答这样的优化方法是否能够用于研究其他系列的亚稳态固态化合物的问题。

This project deals with the development and practical application of a new method that allows the detection of an entire series of metal-halide compounds of a given system within one measurement. Following a general procedure, a halide-rich metal halide (e.g. WCl6) reacts successively with a reduction agent (e.g. metal powder) under progressive heating. Due to the presence of a sufficient amount of metal powder and the formation of a corresponding metal halide, the reaction products (e.g. in the M-W-Cl system) are successively formed under condition of a concentration gradient with increasing amount of metal and decreasing amount of halide. Corresponding reaction steps are monitored as thermal (DTA or DSC) effects and products are characterized by XRD. The application of this method to halide systems allows an assignment of formation reactions, the detection of formation heats, and characterizations of compounds of which the majority can be considered as metastable. Property studies (e.g. magnetic, electrical, or optical) will be performed for selected compounds.Results of these studies are expected to answer the question whether an optimized method like this is capable for investigations of other series of metastable solid state compounds.