Transition Metal Oxides with Correlated Electronic Properties: Synthesis and Characterization

这一研究项目的重点是设计和合成新化合物之间的密切互动，详细表征化合物的物理性质，并了解结构与性质的关系。这一研究项目将为发现有趣的新材料，导致新的现象和有用的应用提供基础。过渡金属(B)钙钛矿(ABO_3；A=稀土、碱土、碱金属离子)、双钙钛矿(AA‘BB’O_6)及其相关的准低维(LD)Ruddlesden-Popper(RP)相[(AO)(ABO_3)n；n=1，2，3]和焦绿石基(A_2B_2O_7)氧化物的合成和表征为发现具有有趣性质的新材料提供了机会。该研究项目系统地研究了稳定新型过渡金属钙钛矿、LD-RP相和焦绿石型化合物的独特合成路线。只要有可能，将尝试生长新的和有希望的相，并将通过一系列物理测量来表征性能。这项研究的一个主要重点是对博士后、研究生和本科生进行固态化学和材料科学中最先进的研究方法的培训。具有重要电磁性能的新型过渡金属氧化物的合成和表征在电子和通信工业中具有重要的应用，例如作为计算机存储芯片元件、传感器和成像设备中的超导元件。此外，这些研究的结果将加强对决定材料性能的因素的基本了解，这将使化学设计和控制新的独特材料成为可能。将强调对博士后、研究生和本科生在固体化学和材料科学方面最先进的研究方法的培训。下一代训练有素的固体化学家和材料科学家是在21世纪保持美国技术领先地位的关键。

The focus of this research project is a close interaction between the design and synthesis of new compounds, detailed characterization of the physical properties and understanding the structure-property relationships. This research project will provide the basis for discovering interesting new materials leading to novel phenomena and useful applications. The synthesis and characterization of transition metal (B) perovskites (ABO3; A = rare earth, alkali earth, alkali metal ions), double perovskites (AA'BB'O6) and related quasi-low-dimensional (LD) Ruddlesden-Popper (RP) phases [(AO)(ABO3)n; n = 1, 2, 3], and pyrochlore-based (A2B2O7) oxides with strongly correlated electronic interactions provide an opportunity to discover new materials with interesting properties. The research project is a systematic study of unique synthetic routes for the stabilization of new transition metal perovskites, LD RP phases and pyrochlore-type compounds. Crystal growth of new and promising phases whenever possible will be attempted and the characterization of properties by a battery of physical measurements will be carried out. A major focus of the research is the training of postdoctoral, graduate and undergraduate students in state-of-the-art reseach methods in solid state chemistry and materials science. The synthesis and characterization of novel transition metal oxides with important electrical and magnetic properties is emphasized for applications in the electronic and communication industries, for example as possible computer memory chip components, sensors, and superconducting elements in imaging devices. Moreover, the results of these investigations will enhance fundamental understanding of the factors that determine material properties, which will enable the design and control of new unique materials by chemistry. The training of Postdoctoral, graduate and undergraduate students in state-of-the-art reseach methods in solid state chemistry and materials science will be emphasized. The next generation of well-trained solid state chemists and materials scientists is essentail for maintaining the leadership of US technology in the 21st century.