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Crystal structures of superconductors Tl2Ba2CaCu2O8 and Tl2Ba2Ca2Cu3O10, which show zero-resistivity at temperatures of 98 and 114 K, respectively, were studied with a high-resolution electron microscope having a resolution of 0.17 nm. High-resolution images clearly revealed arrangements of cations and oxygen vacancies in the superconductors. Computer image simulations provided evidence that a considerable amount of Tl atoms are substituted by Ca atoms.
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Hiraga et al. (1988) studied this question.
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