Abstract
The single crystal habit and structure of new incommensurate-type phases in the system [A 2Cu 2O 3] m [CuO 2] n (where A is alkaline earth and trivalent metals) were analyzed. Needle- and platelet-like crystals were grown from the melt by slow-cooling or decantation. Three modifications of the phases with m/n values equal to 5 7 , 7 10 and 9 13 were distinguished. The distortion of the second structural fragment, the plane of Cu–O ribbons, was determined to be significantly larger than for the first fragment composed of a ladder between two A-cation layers. Superconducting crystals ( T c=80–85 K) were attributed to the modification with m=5 and n=7.
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