We demonstrate that the atom-probe microscope has a unique capability for micro-mass-analyzing the Y-Ba-Cu-O superconducting ceramics. The analysis indicates that the ceramics contain extremely Cu-rich and Ba-rich regions. Even in a Y-Ba-Cu-O region with an appropriate composition the local composition varies noticeably over a range of 20--30 A{}, which is a few times the perovskite lattice parameter.
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Nishikawa et al. (1988) studied this question.
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