TY - JOUR
T1 - Reel-to-reel x-ray diffraction and raman microscopy analysis of differentially heat-treated Y-BaF2-Cu precursor films on metre-length RABiTS
AU - Venkataraman, K.
AU - Lee, D. F.
AU - Leonard, K.
AU - Heatherly, L.
AU - Cook, S.
AU - Paranthaman, M.
AU - Mika, M.
AU - Maroni, V. A.
PY - 2004/6
Y1 - 2004/6
N2 - Reel-to-reel x-ray diffraction (XRD) and Raman micro-spectroscopy are being evaluated as potential diagnostic tools for on-line feedback in the manufacturing of long-length coated conductors. To facilitate this evaluation, a procedure based on differentially heat-treated Y-BaF2-Cu precursors exposed to time-synchronized phase composition gradients has been developed. Two time-gradient-processed YBa2Cu3O7-x (YBCO) tapes of different thicknesses were fabricated using this procedure. The two techniques (used in combination) provided detailed phase and microstructure information as a function of temperature and heat treatment time and identified the same optimum processing time domain windows. More importantly, these deduced optimum times were found to be in close agreement with transport Jc measurements on replicate tapes. In addition, Raman data provided unambiguous identification of key intermediate phases such as BaF2, CuO, Y 2Cu2O5, and barium cuprates. Using these results, a hypothetical Y-BaF2-Cu to YBCO reaction mechanism is proposed.
AB - Reel-to-reel x-ray diffraction (XRD) and Raman micro-spectroscopy are being evaluated as potential diagnostic tools for on-line feedback in the manufacturing of long-length coated conductors. To facilitate this evaluation, a procedure based on differentially heat-treated Y-BaF2-Cu precursors exposed to time-synchronized phase composition gradients has been developed. Two time-gradient-processed YBa2Cu3O7-x (YBCO) tapes of different thicknesses were fabricated using this procedure. The two techniques (used in combination) provided detailed phase and microstructure information as a function of temperature and heat treatment time and identified the same optimum processing time domain windows. More importantly, these deduced optimum times were found to be in close agreement with transport Jc measurements on replicate tapes. In addition, Raman data provided unambiguous identification of key intermediate phases such as BaF2, CuO, Y 2Cu2O5, and barium cuprates. Using these results, a hypothetical Y-BaF2-Cu to YBCO reaction mechanism is proposed.
UR - http://www.scopus.com/inward/record.url?scp=3042604706&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/17/6/002
DO - 10.1088/0953-2048/17/6/002
M3 - Article
AN - SCOPUS:3042604706
SN - 0953-2048
VL - 17
SP - 739
EP - 749
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 6
ER -