Atomic-resolution imaging of oxygen in perovskite ceramics

被引:469
作者
Jia, CL [1 ]
Lentzen, M [1 ]
Urban, K [1 ]
机构
[1] Res Ctr Juelich, Inst Solid State Res, D-52425 Julich, Germany
关键词
D O I
10.1126/science.1079121
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页码:870 / 873
页数:4
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