Defects and Charge Transport in Perovskite-Related Oxides

钙钛矿相关氧化物中的缺陷和电荷传输

• 批准号: 9301068
• 负责人: Donald Smyth
• 金额: $ 34.75万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-15 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9301068&HistoricalAwards=false
• 关键词: Defects; Charge; Transport; Perovskite; Related

This proposal intends to study the recently found important role of hole trapping in perovskite structure titanates. As a result of hole trapping and its consequences, insulating material may be obtained after equilibrium at lower partial oxygen pressure than previously considered possible. This proposed program will focaus on undoped and acceptor-doped BaTiO3 and SrTiO3, and will conduct experiments to further the understanding of the equilibrium defect chemistry of the perovskite titanates and its rel;ationship to properties of technological interest. Second part of the proposed program will be focussed on the defect chemistry and charge transport of perovskite-related oxides, specifically of the brownmillerite A2B2O5 structure and based on indium, gallium, and related elements. %%% This proposed study pursues the recently found important role of hole trapping in perovskite related oxides. It has significant implications with respect to the multilayer ceramic capacitor market. This study aims to pursue the investigation into to the defect chemistry and its relationship to properties of technological interest. Second part of this study will investigate the origin of the high levels of ionic conductivity in oxygen- deficient variants of the perovskite structure such as the brownmillerite structure of A2B2O5. This study will have important contributions to the understanding of materials used in devices of technological importance.

本文旨在研究近年来发现的孔捕获在钙钛矿结构钛酸盐中的重要作用。由于空穴捕获及其后果，可以在比以前认为可能的更低的分氧压下获得平衡后的绝缘材料。该计划将重点研究未掺杂和受体掺杂的BaTiO3和SrTiO3，并将进行实验以进一步了解钙钛矿钛酸盐的平衡缺陷化学及其相关性；与技术利益属性的关系。该计划的第二部分将集中于钙钛矿相关氧化物的缺陷化学和电荷输运，特别是基于铟、镓和相关元素的褐铁矿A2B2O5结构。本研究旨在研究最近发现的空穴捕获在钙钛矿相关氧化物中的重要作用。这对多层陶瓷电容器市场具有重要意义。本研究旨在探讨缺陷化学及其与技术兴趣性质的关系。本研究的第二部分将探讨钙钛矿结构的缺氧变体（如A2B2O5的褐磨矿结构）中高水平离子电导率的起源。这项研究将对理解技术重要性设备中使用的材料有重要贡献。