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A Study of Parameters that Influence Growth and Stability of the (Bi1−xPbx)2Sr2Ca2Cu3Oy Phase

  • J. S. Luo (a1), N. Merchant (a1), V. A. Maroni (a1), D. M. Gruen (a1), B. S. Tani (a1), W. L. Carter (a2), G. N. Riley (a2) and K.H. Sandhage (a2)...

Abstract

The growth and stability of the (Bi1-xPbx)2Sr2Ca2Cu3Oy (Bi-2223) phase contained in silver-sheathed wires has been investigated by a combination of x-ray diffraction, scanning electron microscopy, energy dispersive x-ray analysis, and transmission electron microscopy. Silver tubes loaded with Bi-2223 precursor powders were processed into filaments using established metallurgical techniques. The filaments were then heat-treated at selected temperatures (800 to 845°C) for a range of times (10 to 6000 min) in a 7.5% oxygen atmosphere. From these studies it has been possible to investigate the time-temperature-oxygen pressure domains wherein Bi2Sr2CaCu2O8 (Bi-2212) + second phases transform to Bi-2223. Fractional conversion (Bi-2212 --> Bi-2223) versus time data show good conformance to the kinetic model for a diffusion-controlled reaction at the interface between thin sheets and a fine powder or a fluid. Quenching experiments also reveal that the Bi-2223 phase is stable in a limited temperature interval between 810 and 830°C.

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A Study of Parameters that Influence Growth and Stability of the (Bi1−xPbx)2Sr2Ca2Cu3Oy Phase

  • J. S. Luo (a1), N. Merchant (a1), V. A. Maroni (a1), D. M. Gruen (a1), B. S. Tani (a1), W. L. Carter (a2), G. N. Riley (a2) and K.H. Sandhage (a2)...

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