Effects of varying initial Bi stoichiometry on phase formation of partial melt-processed Bi2Sr2CaCu2Ox

S. Wu, J. Schwartz, G. W. Raban

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Abstract

Phase formation and growth mechanisms of polycrystalline Bi2Sr2CaCu2Ox have been investigated over a broad range of sintering times at the partial melting temperature by scanning electron microscopy (SEM) with quantitative energy dispersive X-ray spectroscopy (EDX), optical microscopy, and magnetization hysteresis measurements. It is observed that the initial powder experienced varying amounts of Bi loss during sintering, and microstructural studies showed the formation of non-superconducting phases (Sr1-yCay)nCuOx (n=1, 2) in addition to the superconducting 2212 phase in all samples. The effects of varying initial Bi stoichiometry on the reduction of secondary phases are investigated. By increasing the Bi content in the starting powder, the number and size of the (Sr1-yCay)nCuOx grains was reduced and the volume fraction of 2212 phase was increased.

Original languageEnglish (US)
Pages (from-to)483-489
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume213
Issue number3-4
DOIs
StatePublished - Aug 15 1993

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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