Quasi-Low-Dimensional Transition Metal Compounds: Synthesis and Characterization

准低维过渡金属化合物：合成与表征

• 批准号: 9907963
• 负责人: Martha Greenblatt
• 金额: $ 40.85万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907963&HistoricalAwards=false
• 关键词: Quasi; Low; Dimensional; Transition; Metal

The focus of this experimental program is to synthesize new materials of strongly correlated electron systems that are on the verge of electronic and structural instabilities, and to fine-tune the competing electronic interactions through the unstable region in a controlled way. Particular emphasis will be placed on the preparation of single crystal specimens to study the structural and orientation-dependent physical properties, including electrical resistivity, magnetic susceptibility, optical and X-ray absorption near-edge spectroscopies. Metal-insulator transitions associated with the onset of charge density waves/spin density waves and/or magnetic ordering; and superconductivity will be sought and characterized, and structural and physical property relationships will be stressed. Systems of interest include: (a). transition metal perovskites and Ruddlesden-Popper phases, An+1BnO3n+1 with A=rare earth and/or alkali and/or alkaline earth metal; B=Mn, Co, Fe (Mn/Fe), Ni and Ru, n=1, 2, 3; (b). niobium cluster compounds; and (c). selected novel structure types of low-dimensional ternary and quaternary transition metal chalcogenides.%%%These studies are expected to yield not only fundamental understanding and control of the properties of novel electronic/magnetic materials, but also to provide advanced materials for potential applications in microelectronics and magnetoelectronics including computers, sensors and communications. These are critical areas for maintaining US technological leadership worldwide. Moreover, the education and training of undergraduate and graduate students and postdoctoral fellows in solid state chemistry/materials science is essential to meet the technological challenges of the twenty first century.

本实验计划的重点是合成处于电子和结构不稳定边缘的强相关电子系统的新材料，并以可控的方式微调通过不稳定区域的竞争电子相互作用。重点将放在单晶样品的制备上，以研究其结构和取向相关的物理性质，包括电阻率、磁化率、光学和x射线吸收近边光谱。与电荷密度波/自旋密度波和/或磁有序有关的金属绝缘体跃迁；并寻求和表征超导性，强调结构和物理性质的关系。感兴趣的体系包括：(a)过渡金属钙钛矿和Ruddlesden-Popper相，An+1BnO3n+1, a =稀土和/或碱和/或碱土金属；B=Mn, Co, Fe (Mn/Fe), Ni, Ru, n= 1,2,3；(b).铌簇化合物；(c)选择新颖结构类型的低维三元和四元过渡金属硫族化合物。这些研究预计不仅会产生对新型电子/磁性材料性质的基本理解和控制，而且还会为微电子和磁电子学（包括计算机，传感器和通信）的潜在应用提供先进材料。这些都是保持美国全球技术领先地位的关键领域。此外，固态化学/材料科学领域的本科生、研究生和博士后的教育和培训对于迎接21世纪的技术挑战至关重要。