Abstract
Diffuse scattering streaks or bands have been observed in electron diffraction photographs for samples belonging to the superconducting system ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ ($0\ensuremath{\le}x\ensuremath{\le}1$). In situ experiments show that this diffuse scattering can be associated with short-range ordering of oxygen vacancies. The same vacancy ordering occurs in previously reduced samples. Three types of diffuse scattering are observed, each corresponding to a short-range-order scheme.
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