Defects and Charge Transport in Perovskite-Related Oxides

这项建议旨在研究最近发现的重要 空穴俘获在钙钛矿结构钛酸盐中的作用。 作为 空穴俘获的结果及其后果，绝缘材料 可以在较低氧分压下平衡后获得 比以前认为的可能。 该计划将 重点研究了未掺杂和受主掺杂的BaTiO 3和SrTiO 3， 进行实验以进一步理解平衡 钙钛矿型钛酸盐的缺陷化学及其关系 科技感兴趣的财产。 二部分 拟议的计划将集中在缺陷化学和 钙钛矿相关氧化物的电荷传输，特别是 棕镁矾A2B2O5结构，并基于铟，镓， 相关元素。 %%% 这项拟议的研究追求最近发现的重要作用， 空穴捕获的研究进展 具有重要 多层陶瓷电容器的含义 市场 本研究的目的是探讨 缺陷化学及其与性能的关系 技术兴趣。 本研究的第二部分将调查 氧中高水平离子传导性的起源 钙钛矿结构的缺陷变体，例如 A2B2O5的棕沸石结构。 这项研究将具有重要意义 有助于理解器械中使用的材料， 技术重要性。

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.