X-ray data and transition temperature measurements of Ca doped Bi2Sr2La2Cu3O10 + δ superconductor

الملخص EN

We studied the effect of Ca- doping on the properties of Bi-based superconductors by adding different amounts of CaO to the Bi2Sr2La2- x Ca x Cu3O10 + δ compound.

Consequently, we obtained three samples A, B and C with x = 0.0, 0.4 and 0.8 respectively.

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

The x-ray diffraction analysis showed that the samples A and B have tetragonal structures conversely the sample C has an orthorhombic structure.

In addition XRD analysis show that decreasing the c-axis lattice constant and thus decreasing the ratio c / a for samples A, B and C respectively.

The X-ray florescence proved that the compositions of samples A, B and C with the ratio of Bi : Sr : La (Ca) : Cu which were about 2 : 2 : 2 : 3.

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

Sample A shows that semiconductor behavior, sample B showed a metal behavior and sample C showed a sup erconductor behaviors with transition temperature at zero resistance Tc (offset) were 85 K.