Abstract
Crystal structures of various copper oxide-based superconducting perovskite compounds are summarized. Atomic arrangements of these perovskite compounds can be investigated by X-ray diffraction, and high-resolution electron microscopy and electron diffraction are quite useful for structural characterization of perovskite-type superconducting copper oxides on the atomic scale. The structure images and electron diffraction patterns include information not only on accurate atomic coordinates of cations but also on ordered arrangements of oxygen atoms and oxygen vacancies. Crystal structures of the various perovskite-type copper oxides can be analyzed from the observed structure images. Modulated structures, defects, intergrowth, surfaces and interfaces can also be investigated. These results are useful for structure analysis of copper oxide-based perovskite ceramics, which are expected to be next-generation superconducting materials.
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