Abstract
The modulated structure in YSr 2Cu 2.5B 0.5O y is characterized by electron diffraction and high resolution electron microscopy. A structural model is postulated for the modulation, in which the periodic changes are considered due to the ordered arrangement of B and Cu atoms in the 123 structure. Computer calculated images for this model are compared with high resolution electron micrographs. Upon in situ heating, the structural modulation disappears at a temperature of around 760 K. Substitution of Ba for Sr in YSr 2Cu 2.5B 0.5O y is found to induce superconductivity and affect the structural modulation.
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