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Preparation by in-situ reaction and physical characterization of Ag(Au) and Ag(Pd) sheathed (Tl, Pb, Bi) (Sr, Ba)2Ca2Cu3O9−δ tapes

Authors
Perin, A.
Abraham, R.
Lebbou, K.
Cohen-Adad, M.Th.
Jordan, J.-L.
Published in Physica C: Superconductivity and Its Applications. 1995, vol. 255, no. 1-2, p. 113-123
Abstract Superconducting tapes with high-purity substituted Tl(1223) powders (> 95 wt.%, Tc ∼120 K) were produced by a new method based on an in-situ reaction under high pressure of helium (25 bar He/0.5 bar O2). A Ag(20 wt.% Au) alloy showed to be a good sheath material for an in-tape reaction up to 990°C, even when involving partial melting of the oxide which favors the grain growth. Due to an interaction between Pd and the oxide, a Ag(6 wt.% Pd) alloy is much less suitable for tape preparation. Reproducible transport critical current densities of 9 kA/cm2 (77 K, 0 T) were obtained for Ag(Au) sheathed Tl(1223) tapes with in-tape-reacted powder, the highest value being 10 kA/cm2. The magnetic-field dependence of jc of such tapes was improved with respect to Ag sheathed tapes with pre-reacted Tl(1223) powders. Locally textured samples with up to 50 μm large plate-like grains were obtained after partial melting in Ag(Au) sheathed tapes.
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GLADYSHEVSKII, Roman et al. Preparation by in-situ reaction and physical characterization of Ag(Au) and Ag(Pd) sheathed (Tl, Pb, Bi) (Sr, Ba)2Ca2Cu3O9−δ tapes. In: Physica C: Superconductivity and Its Applications, 1995, vol. 255, n° 1-2, p. 113-123. https://archive-ouverte.unige.ch/unige:100503

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