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A structural identification of the superconducting phase in the Bi-Sr-Cu-O system has been carried out by X-ray and electron diffraction. A lamellar oxide structure expressed by the formula Bi 2 (Bi, Sr) 2 CuO x  with the orthorhombic a = 0.537 nm, b ≃ 5 · 0.537 nm and c = 2.463 nm (pseudotetragonal subcell a = 0.5369 (1) nm and c = 2.4627(5) nm) is found to be responsible for the superconductive property. The structural model of this compound is compared with the Aurivillius phases.

Structural Study for a New Superconducting Phase in the Bi-Sr-Cu -O System