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-BaF 2 -Cu precursors exposed to time-synchronized phase composition gradients has been developed. Two time-gradient-processed YBa 2 Cu 3 O 7−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 J c measurements on replicate tapes. In addition, Raman data provided unambiguous identification of key intermediate phases such as BaF 2 , CuO, Y 2 Cu 2 O 5 , and barium cuprates. Using these results, a hypothetical Y-BaF 2 -Cu to YBCO reaction mechanism is proposed.
The liquidus temperature (TL) often limits the loading of high-level waste in glass through the constraint that TL must be at least 100°C below the temperature at which the glass viscosity is 5 Pa's. In this study, values of TL for spinel primary crystalline phase were measured as a function of glass composition. The test glasses were based on high-iron Hanford Site tank wastes. All studied glasses precipitated spinel (Ni,Fe,Mn)(Cr,Fe) 2 0 4 as the primary crystalline phase. TL was increased by additions of Cr 2 0 3 , NiO, A1 2 0 3 , Fe 2 0 3 , MgO, and MnO; while Li 2 0, Na 2 O, B 2 0 3 , and Si0 2 had a negative effect. Empirical mixture models were fitted to data.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.