J. Phys. IV France 122 (2004) 117-122
Influence of different factors on the crystallization of Tl 2223/LAO superconducting films deposited by spray pyrolysisH. Nguyen Xuan1, S. Beauquis1, Ph. Galez1, D. De-Barros2, F. Weiss2, M. Decroux3 and M. Therasse3
1 LAIMAN - ESIA, Université de Savoie, BP. 806, 74016 Annecy Cedex, France
2 LMGP, INPG, BP. 46, 38402 Saint-Martin-d'Hères Cedex, France
3 DPMC, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Genève 4, Suisse
The elaboration of Tl-2223 films by a two step process has been investigated. The films contain both Tl-2212 and Tl-2223 phases. We find that the kinetics for the Tl-2212 -> Tl-2223 transformation is very slow due to the texture of the Tl-2212 phase. Critical current densities up to 1.3 MA/cm2 (self-field, 77 K) are however measured. Pure Tl-2223 is obtained when the films are thallinated with a fluorinated source of thallium.
© EDP Sciences 2004