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Influence of lead substitution on the properties of BiSrCaCuO superconducting ceramics and crystals

Abstract We have examined systematically the influence of substitution of lead to bismuth in Bi2Sr2CanCun+1O2n+6, (2 2 n n+1), superconductors. The stabilisation of the (2223) phase is greatly promoted for substitution between 0.5 and 0.7 Bi in the above formula, and virtually single phase ceramics have been obtained, with zero resistivity at T=108K. In (2212) single crystals, we have observed an intermodulation of the incommensurate wave already present in the lead free compounds and the wave specific of lead doping. The wavelength of the latter modulation increases with the lead content. These results are discussed with respect to the increase of the strengh of the bonding between Bi-O layers, present in the structure of these materials, induced by the lead substitution.