Abstract

Stoichiometry-induced deviations of the perfect stacking order in Y-Ba-Cu-O 247 samples are investigated. Several new phases are observed which can be described as polytypoids or as shear structures of the 123 structure, and which differ from the known compounds by the number of 123 cells per unit cell, or by the number of CuO layers in an interleaving CuO multilayer.

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