1 March 1995 Electric-current-stimulated diffusion of heavy ions and oxygen in YBCO (123) and Bi (2223) HTCS films at 4.2 -300 K
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Proceedings Volume 2498, Laser Methods of Surface Treatment and Modification: ALT '94 International Conference; (1995); doi: 10.1117/12.203616
Event: Laser Methods of Surface Treatment and Modification: ALT '94 International Conference, 1994, Konstanz, Germany
Abstract
The results of the study of electrostimulated diffusion in polycrystalline and epitaxial YBCO (123) and ceramic Bi (2223) HTCS films give evidence of the motion of heavy ions and oxygen under the transport superconducting current flow. Long-duration dc flowing in films in the superconducting state at 4.2 and 77 K leads to new morphological forms with modified chemical composition and formation of nonsuperconducting phases. The effect in the high- quality epitaxial films exits, but it is weaker. Long-duration flowing of high-power 36 GHz current leads to formation of periodic strip structures enriched with copper and oxygen. The experiments with thick (25 micrometers ) Bi (2223) films reveal modified stoichiometry practically over the entire film. At 300 K the YBCO (123) system is shown to have the ionic conduction component. Possible mechanisms of the observed experimental effects are discussed.
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E. N. Lubnin, G. N. Mikhailova, Alexander M. Prokhorov, A. S. Seferov, A. V. Troitskii, D. G. Andrianov, S. O. Klimonskii, "Electric-current-stimulated diffusion of heavy ions and oxygen in YBCO (123) and Bi (2223) HTCS films at 4.2 -300 K", Proc. SPIE 2498, Laser Methods of Surface Treatment and Modification: ALT '94 International Conference, (1 March 1995); doi: 10.1117/12.203616; https://doi.org/10.1117/12.203616
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KEYWORDS
Superconductors

Ions

Bismuth

Diffusion

Crystals

Electrodes

Copper

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