Ag-clad Bi-Sr-Ca-Cu-O wires: I. Phase study of fully processed 2:2:1:2 wires

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Abstract

We have studied the composition of phases in fully processed Ag-clad wires containing Bi-Sr-Ca-Cu-O with a starting cation ratio of 2:2:1:2 using electron probe microanalysis. Wires that were processed at temperatures not exceeding 850°C contained two phases: the two-CuO2 layer superconductor (“2212”) and Bi0.06Sr8.87Ca4.87Cu24Ox, which is a member of the “1424” solid solution that is in equilibrium with “2212” at 850°C. Phases identified in wires melt processed at temperatures up to 920°C then annealed at 830–840°C were “2212”, (Sr1−xCax)CuO2, and Ag particles. This appears to be a nonequilibrium phase assemblage as the superconductor is not reported to be in equilibrium with (Sr1−xCax)CuO2 at 800–850°C.

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