Evolution of BiSrCaCuO (2212) Samples by Air Exposure, Showing a Drastic Change of Modulation Very Likely Due to Water Absorption

Boulesteix, C.; Kang, Zhaofeng; Audibert, P; Nitsche, S.; Monnereau, O.

doi:10.1002/pssa.2211220241

Cited by 6 publications

(1 citation statement)

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“…The interaction between 2201 and/or 2212 and an artificial atmosphere such as CO 2 [13], water vapour [14,15], moistened air [10,15,16] and natural air [17][18][19] has also been systematically investigated. The results in artificial atmosphere [13][14][15][16] suggest the degradation of superconductor by bulk action to form carbonate and/or hydroxide while those in natural air [17][18][19] reveal adsorption phenomena such as molecular physisorption of water on BiO planes.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigations of adsorption during fabrication of superconducting tape

Mao¹,

Zhou²,

Wu³

et al. 1997

Supercond. Sci. Technol.

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Intrusion and inheritance of adsorbed gases during fabrication of silver-sheathed (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O x (2223) superconducting tape (Ag/Bi-2223) are confirmed and studied by Fourier transform infrared spectroscopy, x-ray photoemission spectroscopy and Auger electron spectroscopy. Handling in air of precursor powder (BPSCCO powder), composed of (Bi, Pb) 2 Sr 2 CaCu 2 O x (2212), (Ca, Sr) 2 PbO 4 , (Ca, Sr) 2 CuO 3 , CuO and (Bi, Pb) 2 Sr 2 CuO x (2201), causes the physisorption of CH 2 or CH 3 , O 2 , CO 2 , H 2 O and carbide and chemisorption of CO 2 and H 2 O to form CO 3 groups and hydroxyl on the powder. These adsorbates are inherited by the superconducting layer of the Ag/Bi-2223 tape and exist at grain boundaries of the 2223 phase to form weak links, which dramatically degrade the intergrain critical current density (J c ). Mechanisms of intrusion and inheritance of adsorbates are systematically discussed. Our results highlight the importance of atmosphere control during the handling of BPSCCO powder for obtaining high-J c tape.

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