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Published online by Cambridge University Press: 21 February 2011
In this talk we will discuss the use of high resolution transmission electron microscopy (HRTEM) in the study of high Tc superconducting oxides. HRTEM has played an important part in the characterization of microstructure in YBa2Cu3O7−x, and in structure refinement of mixed phase Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O compounds. It is unlikely that HRTEM will contribute to any great extent to the understanding of why these materials are superconductors. But HRTEM will continue to make vital contributions to the studying and understanding of defect structures (such as grain boundaries and planar defects) which interfere with the flow of supercurrents.