Abstract
In this work, we present reference Raman spectra of Bi-2212/Ag tape as evidence that micro-Raman spectroscopy constitutes a rapid and sensitive evaluation tool for high Tc superconductive cuprate (HTSC) tapes. We performed the characterization for the surface and cross sectional areas of tapes, with spot diameters smaller than 1μm. The results of this study confirm that local phase characterization is possible for Bi-2212/Ag tape. Our further attempt to carry out a micro-Raman spectroscopy mapping measurement for the Bi-2212 phase yielded meaningful phase and grain alignment distribution data, even though the measurement spacing was rough and the small observation area. With appropriate upgrades for full-scale characterization with fine measurement spacing and a large observation area, we believe that this spectroscopy will be an effective tool to detect and evaluate precise local changes in Bi-2212/Ag tape. The Raman imaging for Bi-2212/Ag may have a substantial potential to distinguish the distribution of the impurity oxide, degree of grain orientation, crystallinity, nonstoichiometry of the main phase, and other relevant characteristics.
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