Partial substitution effects on structure & electrical properties of high temperature Bi2-x Tlx Ba2-y Sry Ca2 Cu3 O10+δ superconductors

H.Razek, Khalid

	Partial substitution effects on structure & electrical properties of high temperature Bi2-x Tlx Ba2-y Sry Ca2 Cu3 O10+δ superconductors
Tikrit Journal of Pure Science
Article 1, Volume 13, Issue 2, 2008, Pages 63-69
Author
Khalid H.Razek
Abstract
The partial substitution effect of Tl,sr on the structure & electrical properties of high temperature Bi2-x Tlx Ba2-y Sry Ca2 Cu3 O10+δ super conductor have been studied these compounds have been prepared using the solid state reaction method, have been investigated where x=o, 0.05, 0.1, 0.2 & y=0, 0.1, 0.2, 0.3 X-ray diffraction showed that the structure with tetragonal phase with a=b=5.43A0, C=34.18A0 with Tc=123K. where x=0, y=0, but where x=0.05, y=0, the structure remains tetragonal with increasing in c-parameters to 34.81A0 with Tc=128K, on the other hand, when x=0.1, 0.2 the structure has been found that the orthorhombic structure with Tc=100K.[9] It is observed that the system with Y=0.1, 0.2, 0.3 the structure remained as it was and the critical temperature decreased from 123K to 110K. By substituting x and y together, the best structure was at x=0.05, y=0.1 with increasing in critical temperature from 123K to 140K due to increasing in the volume of lattice or by intergowths of a large number of Cu-O layer in the cell that leads to raise [7,8] Tc.

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