Abstract
A new superconducting bismuth oxycarbonate Bi 2− x Pb x Sr 8Cu 4(CO 3) 3O 12 has been synthesized for 0⩽x⩽0.25. This phase represents the n=3 member of the structural series (Bi 2− x Pb x Sr 2CuO 6) (Sr 2CuO 2CO 3) n , i.e. corresponds to an intergrowth of triple oxycarbonate layers with a single 2201 layer. Its structure, characterized by an orthorhombic subcell a≈ b≈ a p√ 2≈5.4 Å and c≈70 Å, is in fact modulated, as for all bismuth cuprates and oxycarbonates, in agreement with the stereoactivity of the 6s 2 lone pair of Bi(III). The critical temperature of this phase (34 K) is close to that of the lead-free first member (30 K) and smaller than that of the second member (40 K), but contrary to the two first members it is not increased by doping with lead.
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