Hydrothermal Synthesis of Novel Solid-State Ternary and Quaternary Metal Telluride Compounds

小行星9310431 拟议的工作是为女科学家和女工程师提供研究规划补助金。 它是关于利用水热合成的新的固态三元和四元金属碲化物化合物的制备、结晶和结构表征的计划和方法。 初步研究将侧重于前体的制备，主要是用作反应物和矿化剂的二元碱金属多碲化物。 在随后的水热反应中，将选择另外的金属或金属络合物与前体反应，得到所需的三元或四元相。 最近的研究工作对固态三元过渡金属碲化物揭示了一些不寻常的结构特征，导致有趣的磁和电行为表现出这些化合物。 它们大多采用独特的低维（链或层）结构。 许多包含具有强金属-金属键合的扩展金属网络。 近年来，碲化物材料的研究越来越受到人们的关注，在合成具有重要性质和应用的新型碲化物材料方面存在着巨大的潜力。 大多数已知的固态碲化物化合物都是在高温下制备的，在低温下的研究很少。 发展低温合成技术的必要性是显而易见的。 水热法是一种重要的低温合成和晶体生长方法。 它在固体化学和材料科学中得到了广泛的应用，并正在得到越来越多的应用。 虽然许多新的分子和扩展系统，如沸石，石英，过渡金属磷酸盐，氧化物，和主族硫化物，已经利用这种技术合成或结晶，包括最近在合成几种早期和晚期过渡金属多硒化物中的成功，实际上还没有对固态碲化物化合物进行研究. ***

9310431 Li The proposed work is a Research Planning Grant for Women Scientists and Engineers. It is concerned with plans and approaches in the preparation, crystallization and structure characterization of novel solid-state ternary and quaternary metal telluride compounds employing hydrothermal synthesis. Initial studies will focus on the preparation of precursors, largely the binary alkali-metal polytellurides that are to be used both as reactants and mineralizers. In subsequent hydrothermal reactions, additional metals or metal complexes will be selected for reaction with the precursors, leading to the desired ternary or quaternary phases. Recent work on the solid-state ternary transition metal tellurides has revealed a number of unusual structural features leading to interesting magnetic and electric behaviors exhibited by these compounds. Most of them adopt unique low dimensional (chain or layer) structures. Many contain extended metal networks with strong metal-metal bonding. An increasing interest in the studies of the tellurides has been exhibited in the last few years, and a great potential exists for synthesis of novel telluride materials with useful properties and applications. Most known solid-state telluride compounds have been prepared at high temperatures, and little has been explored in the lower temperature regime. The need to develop low temperature synthetic techniques is apparent. Hydrothermal synthesis has been proved to be an important and promising method of relatively low-temperature synthesis and crystal growth. It has been widely used and is finding increasing applications in solid state chemistry and material science. While numerous novel molecular and extended systems, such as zeolites, quartz, transition metal phosphates, oxides, and main group sulfides, have been synthesized or crystallized utilizing this technique,including the recent success in the synthesis of several early and late transition metal polyselenides, vi rtually no work has been conducted on the solid- state telluride compounds. ***