The influence of alkaline metals on the properties of Bi-based high temperature superconductors has been studied. The samples Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 A x O y (A = Li or Cs, x = 0, 0.2, 0.4, 0.6, 0.8) were prepared and characterized by XRD analysis, resistivity and susceptibility measurements. The results showed that all the doped samples had T c in the range 104-110.5 K. The transition width ∆T of the Bi-2223 phase in the lithium doped samples increased with higher concentration of dopant. In the cesium doped samples the transition width decreased with increasing Cs level up to x = 0.6 then slightly increased. Values of J c of lithium containing samples decreased with increasing amount of doped lithium. Samples doped with lower amount of cesium (x = 0.2, 0.4) had notably higher critical current densities than the undoped standard. Nevertheless, J c´s of samples with higher amount of cesium were worse than that of the standard. Lithium had a positive influence on the formation of Bi-2223 phase in all concentration except x = 0.6. In samples doped with cesium the volume of Bi-2223 phase was higher than in the undoped sample as well, the values were not as high as in lithium doped samples.
Formation of the high temperature Bi-2223 phase has been studied for samples with nominal composition Bi 3,2-x Pb 0.8 M x Sr 4 Ca 5 Cu 7 O y. M represented V, Nb, Ta, their contents was altered from 0 to 0.6 mol %. The effect of the additives on the growth of the phase 2223, lattice parameters and the superconducting properties of the samples was detected. It was found that the additives enhanced the volume of the 2223 phase, improved the intergrain connection resp. the critical current density. The additives did not affect the lattice parameters and T c significantly.
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