Industry-University Cooperative Research Activity: Off-Center Paraelectric Systems and the Transition from Off-Center to On-Center Behavior (Materials Research)

在这个项目中， 将研究绝缘晶体。 顺电共振 利用静水压力进行的实验将研究 几个系统中的偏离中心的过渡。 扩展X射线 吸收精细结构）将直接测量，独立于 电荷状态，离子或原子的偏心位移， Ag;s+，Cu;s+，Co; s 2;s+，Ag;so和Cu;so。 在某些情况下， 第一次测量，晶格关于一个 偏心缺陷 还将获得阳离子-阴离子的数据 距离在几个系列的缺陷系统，其中的位置 缺陷从偏离中心到中心上变化。 其中一些数据 我将在存在很大差异的系统中测试Vegard定律 离子半径。 这些实验将提供所需的信息 关于偏离中心行为所需的条件。

In this project, the displacement of defect ions and atoms in insulating crystals will be studied. Paraelectric resonance experiments, using hydrostatic pressure, will investigate the on- to off-center transitions in several systems. EXAFS (extended x-ray absorption Fine Structure) will measure directly, independent of the charge state, the off-center displacement of ions or atoms such as Ag;s+, Cu;s+, Co;s2;s+, Ag;so and Cu;so. In some cases, it will measure for the first time, the distortion of the lattice about an off-center defect. Data will also be obtained for the cation - anion distances in several series of defect systems in which the position of the defect varies from off-center to on-center. Some of these data will test Vegard's Law in systems for which there is a large difference in ionic radii. These experiments will provide needed information about the conditions required for off-center behavior.