Local Atomic Structure of Non-Periodic Solids

本课程利用原子对分布函数分析技术探讨准晶、超导氧化物和非晶合金的缺陷结构。PDF方法主要用于无定形固体和液体，现在正用于检查更有序固体中的非周期性原子位移。本研究进一步完善了PDF方法，研究了统计噪声、晶格动力学和提高差分异常x射线散射实验精度的技术。拨款的主要重点是发展对上述材料缺陷结构的理解，这些材料的原子偏离其平均位置的发生率很高。

This program explores the defect structure of quasicrystals, superconducting oxides, and amorphous alloys using the technique of atomic pair distribution function analysis (PDF). The PDF method has been employed primarily for amorphous solids and liquids and is now being used in the examination of non-periodic atomic displacements in more ordered solids. The PDF method is refined further in this research, which examines the statistical noise, lattice dynamics, and techniques for improved accuracy in the differential anomalous x-ray scattering experiments. The main focus of the grant is on developing understanding of defect structure in the above materials, which have high incidence of atoms which deviate in position from their average sites.