Probe-Ion Laser Spectroscoy of Interfaces in Conventional and Nanocrystalline Metal Oxide Ceramics

在分析和表面化学计划的支持下，该学院早期职业发展(CALEAR)项目专注于研究传统陶瓷和纳米晶陶瓷中晶界的结构和缺陷化学。在这项为期三年的持续资助期间，弗吉尼亚理工学院和州立大学的组织教授和他的学生将使用激光激发荧光(LIF)技术来解决这个问题。稀土离子将被加入到陶瓷材料中，这些在材料合成过程中分离在界面上的局部探针将使用激光诱导荧光进行检测。这项研究的目的是(1)表征晶界的结构和缺陷化学，(2)确定探测离子光谱在界面表征中的用途，以及(3)识别限制几何形状的稀土离子的新的光学性质。此外，在这一资助期间，组织教授将继续实施一项教育计划，重点是为仪器分析和分析化学专业的本科生开发和评估化学超媒体。能够探测陶瓷氧化物材料中晶界和缺陷的结构和成分，在材料化学和加工中具有至关重要的作用。这一职业研究项目利用基于稀土的激光诱导荧光来开发一种能够解决这一问题的分析技术。这一职业项目的教育方面将促进将最先进的信息技术整合到本科生和研究生的化学教学中。

This Faculty Early Career Development (CAREER) project, supported in the Analytical and Surface Chemistry Program, focusses on the study of structure and defect chemistry at grain boundaries in conventional and nanocrystalline ceramics. During the tenure of this three-year continuing grant, Professor Tissue and his students at Virginia Polytechnic Institute & State University will approach this problem using laser-excited fluorescence (LIF) techniques. Rare earth ions will be incorporated into ceramic materials and these local probes, which segregate at interfaces during materials synthesis, will be interrogated using LIF. The objectives of this research are (1) to characterize the structure and defect chemistry at grain boundaries, (2) to determine the utility of probe-ion spectroscopy for interface characterization, and (3) to identify novel optical properties of rare-earth ions in restricted geometries. Also during this grant period, Professor Tissue will pursue an education plan that focusses on the development and evaluation of chemistry hypermedia for undergraduate students in instrumental analysis and analytical chemistry. The ability to probe the structure and composition of grain boundaries and defects in ceramic oxide materials is of crucial importance in materials chemistry and processing. This CAREER research project utilizes rare-earth based laser induced fluorescence in the development of an enabling analytical technology with which to address this problem. The educational aspects of this CAREER project will give rise to the integration state-of-the-art information technology in the teaching of chemistry at the undergraduate and graduate levels.