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High‐resolution XPS studies of superconducting Ag/(Bi 0.9 Pb 0.1 ) 2.3 Sr 2.0 Ca 1.9 Cu 3.0 O 10+ x tapes and wires
Author(s) -
Hoad D. R. C.,
Flavell W. R.,
Male S. E.,
Fletcher I. W.,
Beamson G.
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740211105
Subject(s) - x ray photoelectron spectroscopy , superconductivity , materials science , analytical chemistry (journal) , resolution (logic) , high resolution , photoemission spectroscopy , pellets , core (optical fiber) , spectroscopy , chemical composition , condensed matter physics , nuclear magnetic resonance , chemistry , physics , composite material , quantum mechanics , remote sensing , organic chemistry , chromatography , artificial intelligence , geology , computer science
Investigations were carried out on superconducting Ag/(Bi 0.9 Pb 0.1 ) 2.3 Sr 2.0 Ca 1.9 Cu 3.0 O 10+ x (BSCCO) wires and tapes using high‐spatial resolution x‐ray photoelectron spectroscopy. Chemical maps at the interfacial region between the sheath and the superconducting core of the wire samples and also of the core of the tape after peeling were produced using the VG ESCASCOPE, which is capable of sub‐10 μm resolution. Linescans across the Ag/BSCCO interface were produced using the SCIENTA ESCA 300 instrument, which combines high energy resolution with a lateral resolution of ∼25 μm. A series of heat‐treated BSCCO pellets of the same composition as the wire core were also studied. Characterization by x‐ray diffraction, vibrating sample magnetometry and energy‐dispersive analysis by x‐rays showed that the amounts of 2212 and 2223 phases present are a function of the number of heat treatments. Core‐level photoemission studies using the SCIENTA showed changes in the Bi 4f and O 1s peak shapes, which correlate with the change in the proportion of the two phases.