Substitution Effect of Y for Ca in Tl-Ba-Ca-Cu-O System
The substitution effect of Y for Ca in Tl2Ba2CaCu2O8 was studied. With the substituion, Tc decreased and lattice parameters changed systematically. Another phase, however, was found in highly substituted samples. X-ray diffraction and EPMA studies revealed that this new phase has a chemical composition of TIBa2Y1-xCaxCu2O7 (1212 phase) and its structure is similar to both Tl2Ba2CaCu2O8 and YBa2Cu3O7. This structure contains two Cu perovskite-like pyramids sandwiched by monolayer Tl-O sheets, in contrast to that there are bilayer Tl-O sheets in the Tl2Ba2CaCu2Ox and Cu-O chain layer in the YBa2Cu3O7.
For x = 0, electrical property of this phase is semiconductor-like and non-superconducting. With increasing x, it becomes metallic, and for x> 0.3, it exhibits superconductivity.
KeywordsSubstitution Effect Rietveld Analysis Gold Foil Single Phase Sample Crystal Structure Model
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