One and multi-step solid state reaction methods were used to prepare a high temperature superconductor
with a nominal compositionBi2-x LixPb03Sr2Ca2Cu3O10+δ for ( 0 ≤ x ≤ 0 5) T he effect o f
preparation conditions and substituting Li on Bi sites had been investigated by the use of X-ray
diffraction, resistance measurements and oxygen content to obtain the optimum conditions for
formation and stabilization of the 2223-phase It has been found that intermediate grinding will
force to convert and accelerate the formation rate of the 2223-phase The morphological analyses
were carried out by SEM The results showed that the multi-step technique was appropriate to
prepare the compositio Bi2-x LixPb03Sr2Ca2Cu3O10+δ  X-ray diffraction analysis showed two phases:
high-TC phase 2223 and low-TC phase 2212 with orthorhombic structure for all samples However,
the optimum concentration was found for 03 which improved the microstructure and had the
highest TC  value 130 K for the highest value of oxygen content

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Investigating the Preparation Conditions on Superconducting Properties of Bi 2-x Li x Pb 0.3 Sr 2 Ca 2 Cu 3 O 10+δ

We investigated the superconducting parameters of iodine-intercalated BiSrCaCuO high-temperature superconducting materials. While for samples containing a significant amount of Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212) iodine intercalation results in the dramatic decrease of the superconducting parameters, it was found that for samples with a nearly single Bi 2 Sr 2 Ca 2 Cu 3 O 10-y (Bi-2223) phase these parameters can increase. We argue that this different behavior of the superconducting parameters is the result of a different doping regime, and can be explained based on the parabolic dependence between T c and the number of holes per CuO 2 layer. Iodine intercalation appears to be an efficient way to bring the usually under-doped superconductor to its optimal T c and flux pinning properties.

G. Aldica

Papers

Modification of the sperconducting parameters of Bi-Sr-Ca-Cu-O by iodine intercalation