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

产学合作研究活动：偏心顺电系统以及从偏心到中心行为的转变（材料研究）

• 批准号: 8505549
• 负责人: Frank Bridges
• 金额: $ 25.33万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-09-01 至 1989-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8505549&HistoricalAwards=false
• 关键词: Industry; University; Cooperative; Research; Activity

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.

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。