The effect of simultaneous doping of Pb in Tl-Oa layer of TI 1-XPbxBa2Ca2Cu309-6.

الملخص EN

In this paper we have reported investigations 011 the effect of simultaneous substitution of Pb at the Tl-based superconductor was prepared by adding an amount of Pb to the TI1-X PbxBa2Ca2Cu309-6., compound.

Tile usual solid-state reaction method has been applied under optimum conditions.

Bulk polycrystalline samples have been prepared by the two-step solid state reaction process.

It has been observed that the grown TI1-X PbxBa2Ca2Cu309-6 (with X = 0.

00, 0.

10, 0.

20, 0.30 and 0.

40) corresponds to the 1223 phase.

x-ray data of the sample showed a tetragonal structure with a liigh ratio ofTl-1223 superconducting phase.

The samples showed a transition temperatures Tc < 0 wowhich were 120 K.

123 k., 123 k.

129 K.

131 K.

134 K at (x = 0.0, 0.

10, 0.20.

0.

30 and 0.

40) respectively, and the transition temperatures at zero resistance ا-)Tc (off) were 101, 105, 108.

112 and 118 K, respectively.

Resistivities were measured at different temperatures under zero magnetic fields and the data were interpreted.

Ail the samples preparation with 0ئ flow, we found that the O2 flow in our samples produced high- Phase superconductors.

X-ray Effraction analysis showed an increase of the c-axis lattice constant for the samples doped with pb as compared with these have no pb content.

It was found that the change of the pb concentrations of all our samples produced a change in the density pm, c / a and volume fraction Vph(i223j.