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Nuclear microprobe analysis of U-doped (Bi,Pb)2Sr2Ca2Cu3Oy/Ag superconducting tapes |
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| Authors: | B Rout J Hendriks D N Jamieson R Szymanski D Milliken S X Dou |
| Affiliation: | a School of Physics, Microanalytical Research Centre, University of Melbourne, Vic. 3010, Australia b Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands c Institute of Superconducting & Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia |
| Abstract: | Superconducting (Bi,Pb)2Sr2Ca2Cu3Oy/Ag tapes are doped with uranium compounds to introduce flux pinning defects from neutron-induced fission. The composition and distribution of elements in cross sections of the tapes were probed with a scanned 3 MeV proton microbeam using proton induced X-ray emission (PIXE). Distributions of the constituent elements were found to be heterogeneous on a scale of 10 μm. By combining the PIXE analysis with Rutherford backscattering spectrometry, the stoichiometry of the superconductor within the tape was measured, including oxygen from elastic scattering, revealing a departure from the desired 2223 composition. In one of the tapes, PIXE elemental maps of the Ag distribution showed diffusion of Ag into the superconductor from the enclosing jacket. Crystals of the same material, not fabricated into tapes, did not contain the contaminants and had a more ideal stoichiometry. Correlation maps between the constituent elements, deduced from the elemental maps, indicate the presence of secondary or unreacted phases. |
| Keywords: | HTC superconductor Nuclear microprobe RBS PIXE |
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