Abstract
Reel-to-reel x-ray diffraction (XRD) and Raman micro-spectroscopy are being evaluated aspotential diagnostic tools for on-line feedback in the manufacturing of long-length coatedconductors. To facilitate this evaluation, a procedure based on differentially heat-treatedY–BaF2–Cu precursorsexposed to time-synchronized phase composition gradients has been developed. Two time-gradient-processedY Ba2Cu3O7−x (YBCO) tapes of different thicknesses were fabricated using this procedure. The twotechniques (used in combination) provided detailed phase and microstructureinformation as a function of temperature and heat treatment time and identifiedthe same optimum processing time domain windows. More importantly, thesededuced optimum times were found to be in close agreement with transportJc measurements on replicate tapes. In addition, Raman data providedunambiguous identification of key intermediate phases such asBaF2,CuO, Y2Cu2O5, and barium cuprates. Using these results, a hypotheticalY–BaF2–Cu to YBCO reaction mechanism is proposed.
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