Flux Syntheis and Properties of New Crystalline and Glassy Chalcogenides

新型晶态和玻璃态硫属化物的助熔剂合成及性能

• 批准号: 0127644
• 负责人: Mercouri Kanatzidis
• 金额: $ 38.4万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0127644&HistoricalAwards=false
• 关键词: Flux; Syntheis; Properties; New; Crystalline

The goal of this project is to synthesize and characterize new solid-state materials in the metal thiophosphate and selenophosphate families. The metal thiophosphate and selenophosphates show a very rich chemistry that is based on anions that form in chalcophosphate fluxes by simple in-situ fusion, and these act as fundamental structural building blocks. Areas to be explored include alkali metal-free ternary metal-and rare-earth-metal- thiophosphates and selenophosphates, corresponding alkali metal quaternary derivatives and also glasses formed from the manipulation of these materials. Thioarsenate and selenoarsenate fluxes will also be explored to discover corresponding arsenic compounds. Characterization of the new materials will include structural determinations by single-crystal X-ray scattering methods and the measurement of physical properties such as optical absorption, thermal behavior and electrical conductivity. The structure of glasses will be probed with pair distribution function (PDF) analysis. The molten alkali poly-thiophosphate and poly-selenophosphate salts, which are the reactive solvents in this project, will be studied by Nuclear Magnetic Resonance spectroscopy in order to understand the identity, distribution, and chemistry of the anions that form in chalcophosphate fluxes. Eventually we wish to control the stabilization and incorporation of specified building blocks in synthetic target compounds. The ultimate goal of this research project is to enhance our knowledge of the chemistry of chalcogenides and render the chemistry more controllable and predictable so useful new materials can be designed. This project has a very strong education component that aims to educate students in the advanced subject of solid state synthesis including non-oxide materials discovery and novel state-of the-art laboratory techniques.The discovery of new classes of solid state materials with novel composition and structure, as well as an understanding of their chemical behavior and physical properties such as optical and electronic behavior are important to industry. For example, the glass versions of the metal-thiophosphate and -selenophosphates show controllable amorphous to crystal phase changes and may have potential for memory storage applications. Students trained in these areas are well poised to exploit current and future academic and industrial job opportunities.

该项目的目标是合成和表征金属硫代磷酸盐和硒代磷酸盐家族的新固态材料。金属硫代磷酸盐和硒代磷酸盐显示出非常丰富的化学性质，其基于通过简单的原位融合在硫代磷酸盐熔剂中形成的阴离子，并且这些阴离子充当基本的结构构建块。待探索的领域包括无碱金属的三元金属和稀土金属硫代磷酸盐和硒代磷酸盐，相应的碱金属四元衍生物以及由这些材料的操作形成的玻璃。硫代砷酸盐和硒代砷酸盐通量也将进行探索，以发现相应的砷化合物。新材料的表征将包括通过单晶X射线散射方法确定结构和测量物理特性，如光吸收、热行为和电导率。眼镜的结构将用成对分布函数（PDF）分析来探测。熔融碱聚硫代磷酸盐和聚硒代磷酸盐，这是在这个项目中的反应溶剂，将通过核磁共振光谱研究，以了解身份，分布和化学的阴离子形成的硫代磷酸盐焊剂。最终，我们希望控制合成目标化合物中特定结构单元的稳定化和掺入。该研究项目的最终目标是提高我们对硫属化合物化学性质的认识，使化学性质更加可控和可预测，从而可以设计出有用的新材料。该项目具有很强的教育成分，旨在培养学生在固态合成的高级学科，包括非氧化物材料的发现和最先进的实验室技术。发现具有新组成和结构的新型固态材料，以及了解其化学行为和物理性质，如光学和电子行为，对工业非常重要。 例如，金属硫代磷酸盐和硒代磷酸盐的玻璃版本显示出可控的非晶到晶体的相变，并可能具有存储器存储应用的潜力。 在这些领域接受培训的学生已经做好充分准备，以利用当前和未来的学术和工业就业机会。