CAREER: Correlating the Microstructure with the Physical Properties of Perovskite and Related Oxide Materials

职业：将钙钛矿及相关氧化物材料的微观结构与物理性能联系起来

• 批准号: 0449886
• 负责人: Edwin Walker
• 金额: --
• 依托单位: Southern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0449886&HistoricalAwards=false
• 关键词: CAREER; Correlating; Microstructure; Physical; Properties

This CAREER project focuses on understanding the mechanisms that govern ion transport in perovskites and related oxides (PRO) with interesting and useful ionic transport properties. Specifically, this project will investigate the correlation of microstructure of PRO's with their physical properties to elucidate the structural and compositional factors that influence the ionic conductivity. The project involves the low temperature synthesis of nanocrystalline PRO's such as La0.6Sr0.4MnO3 with varying compositions and crystallite sizes using the novel 3,3',3"-nitrilotripropionic acid precursor gel method and the characterization of the nanocrystalline PRO's using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) in conjunction with impedance spectroscopy to investigate the relationship between structure, composition, and physical properties (ion transport in particular). Structural and conductivity data will be analyzed and correlated to determine the relationship between grain size, grain boundaries, defects and vacancies on bulk ion diffusion. Undergraduate students will participate significantly in the synthesis, characterization, and physical analysis of these oxide-conducting materials.This CAREER project will yield new insights into the mechanisms that govern ion transport in PRO's. Since the possible composition of perovskites and their electronic and ionic transport properties remain relatively unexplained, the successful investigation of the structural and compositional factors that influence the ionic conductivity in nanocrystalline PRO ion conductors in this study will represent a relatively significant contribution to the area of solid-state PRO conductors. A better understanding of ionic transport in PRO's will have a significant impact on the economic and commercial barriers in a multitude of applications ranging from portable devices to homes and vehicles. Additionally, this project will also have a significant impact on under-represented minority students at Southern University, a Historically Black College and University and a Primarily Undergraduate Institution, by exposing them to materials science-related research, a field where the numbers of minority students are very scarce. Students will be given the opportunity for hands-on experience that results in a more meaningful undergraduate research experience.

该职业项目的重点是了解具有有趣且有用的离子运输特性的钙钛矿和相关氧化物（Pro）的机制。 具体而言，该项目将研究Pro的微观结构与其物理特性的相关性，以阐明影响离子电导率的结构和组成因子。该项目涉及纳米晶体Pro的低温合成，例如LA0.6SR0.4MNO3，使用新颖的3,3'，3“ - 硝基亚基酸前体凝胶方法以及使用Nanocrystalline Pro的电源和X-Ray diffrions（X-ray diffract）的元素，使用3,3” - 硝基化酸性凝胶方法（x-ray diffration（x-ray diffration）（x-ray diffrate and x-rad diffration）（x-ray diffress）（x-ray diffress（x-ray）（x-ray）（x-ray diffration（x-restrance）） （HRTEM）与阻抗光谱一起研究结构，组成和物理特性之间的关系（尤其是离子传输），将分析和电导率数据。材料。这项职业项目将产生对pro中离子运输的机制的新见解，因为钙矿的组成及其电子和离子运输属性仍然相对无法解释，因此对纳米晶体电导率的离子电导率的结构和组成因素的成功调查将在纳米晶体中代表一项相对的贡献。 对Pro中离子运输的更好理解将对从便携式设备到房屋和车辆的多种应用中的经济和商业障碍产生重大影响。此外，该项目还将对南方大学，一所历史悠久的黑人学院和大学以及主要本科机构的代表性不足的少数群体学生产生重大影响，通过将它们暴露于材料与科学相关的研究中，这是少数群体学生人数非常稀缺的领域。 将为学生提供实践经验的机会，从而带来更有意义的本科研究经验。