Atomic-Resolution Imaging of Oxygen in Perovskite Ceramics

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7 February 2003

journal article
other
Published by American Association for the Advancement of Science (AAAS) in Science

Vol. 299 (5608) , 870-873
https://doi.org/10.1126/science.1079121

Abstract

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.

Keywords

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