Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Postersitzung I: Anwendungen der Supraleitung (1-6), Dünne Schichten, Josephsonkontakte, SQUIDs (7-17), Neue und unkonv. Supraleiter(18-23), Amorphe- und Tunnelsyst. (24-28), Quantenflüssigkeiten (29-30), Syst. korr. Elektr.: Theorie I (31-45)
TT 7.1: Poster
Montag, 11. März 2002, 14:30–18:00, A
Corrosion of Epitaxial YBCO Films — •Ermile Gaganidze1, Roland Heidinger1, Juergen Halbritter1, Christian Neumann2, Frank Schnell2, and Tobias Kaesser3 — 1Forschungszentrum Karlsruhe, IMF I, Postfach 3640, D-76021 Karlsruhe — 2Robert Bosch GmbH, FV/FLT, Postfach 106050, 70049 Stuttgart — 3Bosch SatCom GmbH, UC-RA/EMD, Gerberstr. 49, 71522 Backnang
Rf superconducting devices are very sensitive to corrosion because of the small penetration depth λ ≤ 200 nm of rf field. Space qualification of the HTS filters requires resistance against corrosion during 3 weeks at 40 C and 93% rel. humidity. To tolerate those severe atmospheric conditions HTS films need a protective layer to avoid electrochemical dissolution [1]. This dissolution has been reduced by a thin BaF2 protective layer produced by soaking YBCO films for 10 min in HF(40%). Results on RS(Hrf, 77 K) of YBCO films of different quality before and after HF-soaking as well as after exposing the films to high humidity atmosphere are presented and explained by weak-link corrosion. [1] M. Regier et al., IEEE Trans. Appl. Superconductivity 9, 2452 (1999).