Abstract
A new member of the layered cuprates, Pb 2Sr 2LnCeCu 3O 10+δ(Ln = Pr, Nd, Sm, La) has been isolated. It crystallizes in the space group Fmmm with a = 5.442 (4) Å, b = 5.462 (4) Å, c = 36.90 (2) Å but a weak superstructure is observed by electron diffraction. Its structure consists of a triple intergrowth of single rock salt layers, double fluorite-type layers and oxygen deficient perovskite layers. In fact such a framework can be deduced from that of Pb 2Sr 2Y 0.5Ca 0.5Cu 3O 8 by replacing the single fluorite “yttrium” layers by double fluorite-type layers. The disproportionation of copper in that phase and the absence of superconductivity are discussed.
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