Local Atomic Structure of Complex Oxides

复杂氧化物的局部原子结构

• 批准号: 0404835
• 负责人: Takeshi Egami
• 金额: $ 15.33万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0404835&HistoricalAwards=false
• 关键词: Local; Atomic; Structure; Complex; Oxides

0102565Egami Complex electronic oxides that show remarkable properties, such as the colossal magnetoresistive (CMR) manganites and the high-temperature superconductive cuprates, have atomic and nano-scale local structures that are distinct from the average crystal structure, and these local structures more directly influence their electronic properties than the average structure does. The goal of this project is to determine the local structure of complex electronic oxides using pulsed neutron scattering, synchrotron x-ray scattering and modeling. We directly determine the distances between atoms using the method of the atomic pair-density function (PDF) analysis of the total scattering data including diffuse scattering. %%%The knowledge obtained by this project would form a scientific basis for the rapidly developing technology of highly sensitive oxides, and would suggest ways of improving their performance. This project is also related to the effort to upgrade a pulsed neutron powder diffraction beamline, NPD, at the Los Alamos Neutron Science Center, supported by the NSF and DOE.

0102565EGAMI复合电子氧化物，这些氧化物具有显着特性，例如巨大的磁磁化（CMR）锰硅酸盐和高温超导蛋糕，它们具有原子和纳米尺度的局部结构，它们与平均晶体结构不同，这些局部结构与平均电子结构更直接地影响了它们的平均值。 该项目的目的是使用脉冲中子散射，同步X射线散射和建模来确定复杂电子氧化物的局部结构。 我们使用原子配对密度函数（PDF）分析（包括弥散散射）的方法直接确定原子之间的距离。 %%％这些项目获得的知识将为高度敏感的氧化物快速开发的技术构成科学基础，并建议改善其性能的方法。 该项目还与升级NSF和DOE支持的Los Alamos中子科学中心的脉冲中子粉末衍射光束线NPD NPD有关。