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.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering