Degradation in Bi-Sr-Ca-Cu-O Thin Films Exposed to Water

Abstract

A new dual elementary-steps growth mechanism was observed during our research on the CdHg(SCN) 4 (H 6 C 2 OS) 2 (CMTD) crystals. Namely two types of elementary-step sources with different step height can be produced on the same crystal surface during the growth of some crystals. Furthermore the sum of these elementary-step heights is equal to the corresponding interplanar distance d hkl . The heights of these elementary steps were determined by crystal structure as well as growth motif and they have no relation to crystal defects. The elementary steps referred in this paper are completely different to sub-step mentioned by Min in 1988. Only one step height h was included in normal growth rate formulas for the dominant crystal growth theories at present such as BCF spiral growth mechanisms and the classic two-dimensional nuclear growth modes. Without considering the effects of the dual elementary-steps h 1 and h 2 to the growth procedure, the classic formulas containing the parameter h (step height) should be modified when they are applied to the research on crystals growing with dual elementary-steps growth mechanism.

Origin of the insulating state in exfoliatedhigh-Tctwo-dimensional atomic crystals

“…This suggests that the insulating behavior observed in single unit cell BSCCO [4] is an extrinsic effect. BSCCO is also known to be sensitive to water and so moisture in the air may also play a role in degrading the surface of the two-dimensional atomic crystal samples [31].…”

X-ray photoelectron spectroscopy of ceramic composites Bi,Pb-2223/Ag annealed in an atmosphere with a reduced content of oxygen (7.5% O2 + 92.5% N2)

“…Various explanations of this effect exist. The authors of [12][13][14] report that the 2212 ceram ics interacts with H 2 O and CO 2 and that its electrical and magnetic properties degrade at that. The authors of [15,16] state that the B-Pb-Sr-Ca-Cu-O ceramics is more stable than the 123 ceramics.…”

Corrosion of bismuth-based superconductor wires by some atmospheric agents

“…The physical properties of the bismuth-based superconductors (BBSs) (Bi, Pb)-Sr-Ca-Cu-O have been extensively studied due to the great interest they have generated [1][2][3][4]. Some studies of their corrosion by atmospheric agents have also been performed [5][6][7][8][9]. The corrosion of Bi 2 Sr 2 CaCu 2 O 8 (noted Bi-2212) by air, water or dry or humid CO 2 has previously been studied [6,8,9].…”