Abstract
Substitution effects of Pb in Bi2Sr3-y Cay CU2Oz have been studied. The solubility of Pb depends upon the Ca/Sr ratio as well as the atmospheric oxygen pressure. Monophasic products can be obtained in a range of O<x<0.7 for Bi2-xPbxSr1.5 Ca1.5Cu2Oz if these are treated in Ar at 700°C after being treated, as usual in air at 820°C. The structure symmetry changes from tetragonal to orthorhombic as Pb content increases. The modulation period is elongated monotonically as x increases, finally the modulation disappearing at x=1.2 for Bi2-xPbxSr1.5Ca1.5Cu2Oz. The monophasic region is thus rather narrow, however the changes in lattice constants for the 30Å-phase appearing in a wide variety of multi phase samples suggest that monophasic region would be considerably widened if the stoichiometry of 2:3:2 is not observed.
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