Crystallography and microstructure of Tl-Ca-Ba-Cu-O superconducting oxides

Beyers, R.; Parkin, S. S. P.; Lee, V. Y.; Nazzal, A. I.; Savoy, R.; Gorman, G.; Huang, T. C.; La Placa, S.
August 1988
Applied Physics Letters;8/1/1988, Vol. 53 Issue 5, p432
Academic Journal
We report on the crystallography and microstructure of six oxides in the Tl-Ca-Ba-Cu-O system with nominal compositions Tl1Ba2Cu1O5, Tl1Ca1Ba2Cu2O7, Tl1Ca2Ba2Cu3O9, Tl2Ba2Cu1O6, Tl2Ca1Ba2Cu2O8, and Tl2Ca2Ba2Cu3O10. The structures consist of one, two, or three Cu perovskite-like units sandwiched between Tl-O monolayers or bilayers. The predominant defects in the crystals with bilayer and trilayer Cu perovskite-like units are stacking faults that produce local intergrowths of related structures. The density of stacking defects in these oxides correlates with changes in the superconducting transition temperatures.


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