STRUCTURAL STUDIES ON THE SUPERCONDUCTING PHASE Bi4Sr4Ca2Cu4O2−δ

Abstract
Very recently H. Maeda et al.1 reported a high Tc superconducting material of the composition BiSrCaCu2O χ that makes a feature of containing no rare earth metal. We are interested in the structural and chemical aspects of this new class of materials.2 We have prepared a homogeneous sample for the superconducting phase in the Bi-Sr-Ca-Cu-O system, and have determined its crystal structure by powder XRD method. At a very late stage we noticed the structural work by a Bellcore group.3 Fortunately our work has quite a number of distinguishable features.

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