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Doping the Bi2212 phase by Pb usually results in an enhancement of the pinning properties and the  T  c . Using elements other than Bi and/or other sites one may obtain opposite results. In this work we present the effect on structural and magnetic properties of Bi2212 superconducting ceramics when co-doping with La and Pb is used. Bi 1.4 Pb 0.6 Sr 2 Ca 1– x  La  x  Cu 2 O 8 +δ (0 ≤  x  ≤ 0.025) superconducting ceramic samples were prepared using a solid-state reaction method. Structural and magnetic characterizations were made by means of X-ray diffraction, scanning electron microscopy and AC susceptibility measurements. The obtained crystalline structure is mainly tetragonal with a c-axis lattice parameter decreasing with La content. Substitution by La reduces the fraction content of the parasitic phase Bi2201 and the size of the grains. The transition temperature T c  is enhanced quasi linearly with the La content and the superconducting volume fraction has a maximum for  x  = 0.01.

Effect of co-doping by Pb and La on structural and magnetic properties of Bi2212 superconducting ceramics