Title :
Corrosion of superconductors-especially of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// cuprate
Author :
Regier, M. ; Keskin, E. ; Halbritter, J.
Author_Institution :
Inst. fur Materialforschung, Forschungszentrum Karlsruhe, Germany
fDate :
6/1/1999 12:00:00 AM
Abstract :
Electronic properties of superconductors deteriorate with time by oxidation or other chemical attack enforced by thermal cycling. Despite being oxides, cuprate superconductors deteriorate in lab atmosphere. The corrosion of, e.g., YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) is mainly caused by H/sub 2/O and CO/sub 2/, which react to Ba-hydroxide and to Ba-carbonate. As reaction paths the CuO-chain-BaO-layers are the fastest ones, whereas the out-of-plane paths are slower. Grain and twin boundaries or strain have been identified as paths for O-diffusion or reaction with H/sub 2/O and CO/sub 2/.
Keywords :
barium compounds; corrosion; diffusion; heat treatment; high-temperature superconductors; oxidation; twin boundaries; yttrium compounds; O-diffusion; YBa/sub 2/Cu/sub 3/O/sub 7/; chemical attack; corrosion; grain boundaries; oxidation; thermal cycling; twin boundaries; Corrosion; Granular superconductors; Impurities; Niobium; Oxidation; Superconductivity; Surface cleaning; Surface morphology; Surface resistance; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
