Atomic-resolution imaging of oxygen in perovskite ceramics
Atomic-resolution imaging of oxygen in perovskite ceramics
复制标题
DOI：
10.1126/science.1079121
复制
发表时间：
2003-02-07
期刊：
影响因子：
56.9
通讯作者：
Urban, K
中科院分区：
文献类型：
--
作者：
Jia, CL;Lentzen, M;Urban, K
使用基于透射电子显微镜的物镜透镜的球差系数的负值的调节的成像模式，我们成功地成像了电介质SrTiO 3和超导体YBa 2 Cu 3 O 7中的所有类型的原子柱。特别是，我们能够看到氧原子，由于其低散射能力，以前是不可访问的，这使我们能够检测到本地非化学计量或氧空位有序的程度。这项技术为研究氧化物、矿物和陶瓷提供了有趣的机会。特别地，这适用于大量的钙钛矿衍生的电瓷材料，其中局部氧含量敏感地控制电子性质。
Using an imaging mode based on the adjustment of a negative value of the spherical-aberration coefficient of the objective lens of a transmission electron microscope, we successfully imaged all types of atomic columns in the dielectric SrTiO3 and the superconductor YBa2Cu3O7. In particular, we were able to view the oxygen atoms which, due to their low scattering power, were not previously accessible, and this allowed us to detect local nonstoichiometries or the degree of oxygen-vacancy ordering. This technique offers interesting opportunities for research into oxides, minerals, and ceramics. In particular, this holds for the huge group of perovskite-derived electroceramic materials in which the local oxygen content sensitively controls the electronic properties.