Abstract
The microstructures of high-Tc superconducting oxides such as Ba2LnCu3Oy (Ln : Y and lanthanoides) and Bi2 (Sr, Ca) n+1CunOy (n=2 or 3) are examined by a high resolution transmission electron microscope (HRTEM). Arrangements of metal atoms in these compounds are directly observed in HRTEM images. Existences of oxygen vacancies, planar defects, twinnings, dislocations, 90-degree domains etc. are found in Ba2LnCu3Oy. On the other hand, intergrowth structures, twinnings and incommensurate modulated structures are found in Bi2 (Sr, Ca) n+1CunOy.
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