New phases with incommensurate-type structure in RE–Ba, Sr, Ca–Cu–O and Bi, Pb–Sr–Ca, RE–Cu–O systems

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 phase...

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Bibliographic Details
Published in:Journal of crystal growth 1998-04, Vol.187 (1), p.65-71
Main Authors: Leonyuk, L, Babonas, G.-J, Maltsev, V, Shvanskaya, L, Dapkus, L
Format: Article
Language:English
Subjects:
Crystal structures
Cuprates
Incommensurate phases
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Summary: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.
ISSN:0022-0248
1873-5002
DOI:10.1016/S0022-0248(97)00835-X