Preparation of unleaded Bi₂Sr₂Ca₂Cu₃O₁₀

Abstract

Communication: The 2223 single‐phase region in the Bi 2 O 3 –SrO‐CaO‐CuO system has been defined, enabling the preparation of pure (> 90%), unleaded Bi 2 Sr 2 Ca 2 Cu 3 O 10 . The bismuth content of the superconductor, which is better suited for research than the leaded variety, is found to be significantly higher (at 2.5) than expected from the exact stoichiometry. The preparation conditions and the phase diagram are discussed.