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- W4250680798 abstract "The chemical nature of grain boundaries in YBa2Cu3O7−δ (YBC) ceramic and YBC/Ag random composites was investigated using x-ray photoemission spectroscopy carried out on in situ fractured specimens. A change in the Ba core emission level indicated a cleaning of grain boundaries when silver was present. For low silver content (5 wt.%), an increase of the formal Cu3+/Cu2+ ratio was observed and interpreted as silver incorporation in the YBC lattice. For higher silver content (20 wt.%), Ag–Cu intermetallic species were observed, resulting from reaction of the excess silver present at grain boundaries with the YBC. These chemical modifications were consistent with resistivity measurements. Copyright © 2000 John Wiley & Sons, Ltd." @default.
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- W4250680798 date "2000-08-01" @default.
- W4250680798 modified "2023-09-30" @default.
- W4250680798 title "XPS studies of YBa2Cu3O7/Ag high‐TC superconductor" @default.
- W4250680798 doi "https://doi.org/10.1002/1096-9918(200008)30:1<448::aid-sia865>3.3.co;2-i" @default.
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