TY - JOUR
T1 - Effects of varying initial Bi stoichiometry on phase formation of partial melt-processed Bi2Sr2CaCu2Ox
AU - Wu, S.
AU - Schwartz, J.
AU - Raban, G. W.
N1 - Funding Information:
This work was supported by the National Science Foundation (DMR 91-20000) through the Science and Technology Center for Superconductivity. The SEM/EDX and optical microscopy were carried out at the Center for Microanalysis of Materials, University of Illinois at Urbana-Champaign (UIUC), which is supported by the US Department of Energy under contract DEFG02-91-ER45439. Digital image processing and analysis was carried out at National Center for Supercomputing Applications, UIUC. The ICP analysis was completed at the School of Chemical Science Microanalytical Laboratory, UIUC. Special thanks are given to T.T. Pleune for assistance with sample preparation and image processing, and D.J. Miller of Argonne National Laboratory for providing a Bi-Sr-Ca-Cu reference sample.
PY - 1993/8/15
Y1 - 1993/8/15
N2 - 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.
AB - 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.
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U2 - 10.1016/0921-4534(93)90469-7
DO - 10.1016/0921-4534(93)90469-7
M3 - Article
AN - SCOPUS:0027643786
SN - 0921-4534
VL - 213
SP - 483
EP - 489
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 3-4
ER -