Transition Metal Oxides with Correlated Electronic Properties: Synthesis and Characterization

本研究项目的重点是新化合物的设计和合成之间的密切互动，物理性质的详细表征和结构-性质关系的理解。该研究项目将为发现有趣的新材料提供基础，从而导致新的现象和有用的应用。过渡金属(B)钙钛矿（ABO3; A =稀土、碱土、碱金属离子）、双钙钛矿（AA'BB'O6）及相关准低维（LD） Ruddlesden-Popper （RP）相[(AO)(ABO3)n]的合成与表征n = 1,2,3]和具有强相关电子相互作用的焦绿基（A2B2O7）氧化物为发现具有有趣性质的新材料提供了机会。该研究项目是对新型过渡金属钙钛矿、LD RP相和焦绿石型化合物稳定的独特合成路线的系统研究。只要有可能，将尝试新的和有前途的相的晶体生长，并通过一系列物理测量来表征其性质。研究的一个主要重点是培养博士后、研究生和本科生在固体化学和材料科学领域最先进的研究方法。具有重要电学和磁学特性的新型过渡金属氧化物的合成和表征被强调在电子和通信工业中的应用，例如可能作为计算机存储芯片组件，传感器和成像设备中的超导元件。此外，这些研究的结果将增强对决定材料性质的因素的基本理解，这将使化学设计和控制新的独特材料成为可能。重点培养博士后、研究生和本科生在固体化学和材料科学领域的最新研究方法。下一代训练有素的固态化学家和材料科学家对于保持美国在21世纪的技术领先地位至关重要。

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.