Yt. Wang et al., The study of critical current density of superconducting thallium oxide films from spray-deposited precursors, INT J HYD E, 26(12), 2001, pp. 1289-1293
Spray deposition is a promising and economic approach for fabricating high-
temperature superconducting films for the Tl-oxide superconductors. The Tl-
oxides provide the potential for operation at 77 K in practical magnetic fi
elds of 3-5 T, which has been demonstrated by measurements on the irreversi
bility behavior of the Tl-1223 single layer compound with Bi and Sr substit
ution. In this report, we present the preparation and characterization of T
l0.78Bi0.22Sr1.6Ba0.4Ca2Cu3O9 superconducting films fabricated from spray-d
eposited Tl-free, Ag-containing and Cu-rich precursors and reacted with tha
llium vapor using a two-step crucible process at 650 degreesC/815 degreesC
in flowing argon for only 10/10 min. An epitaxial superconducting film was
synthesized successfully and critical cur-rent densities of 8 x 10(5) A/cm(
2) at 77 K in zero-field were obtained with excellent in-field performance.
(C) 2001 Published by Elsevier Science Ltd on behalf of the International
Association for Hydrogen Energy.