Crystallography and microstructure of Tl-Ca-Ba-Cu-O superconducting oxides
Abstract
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 1988
- DOI:
- 10.1063/1.100611
- Bibcode:
- 1988ApPhL..53..432B
- Keywords:
-
- Barium Oxides;
- Copper Oxides;
- Crystallography;
- High Temperature Superconductors;
- Microstructure;
- Calcium Oxides;
- Perovskites;
- Solid Phases;
- Thallium Compounds;
- Solid-State Physics