Title :
Tl-based films grown on silver tape substrates
Author :
Falcony, C. ; Jergel, M. ; Morales, A. ; Garcia, M. ; Hernandez, R.T. ; De Ita, A. ; Cabanas-Moreno, J.G. ; Palacios G., J. ; Martinez, R.
Author_Institution :
Dept. de Fisica, CINVESTAV-IPN, Mexico City, Mexico
fDate :
6/1/1999 12:00:00 AM
Abstract :
The Tl-based superconductors belong to potential candidates for high-current and high-field applications. It is therefore of importance to prepare them in the shape of tapes and wires. It seems that silver tape is a very convenient material having suitable mechanical properties as well as chemical compatibility with superconducting films deposited and grown on top of them. In our case, Tl-based films were grown using a two-step procedure. First, the Ba-Ca-Cu precursors were deposited on a commercial silver tape from an aerosol, and then the precursors were thallinated in a closed crucible with a source of Tl-oxide in the form of a crude pellet. Results are reported on superconducting samples consisting so far of 2212, 2223 and 1223 phase mixtures. SEM observations reveal the growth of plate-like grains. Metallurgical processing of silver tape is underway to obtain a cubic texturized substrate which should help to improve transport properties of the grown films.
Keywords :
barium compounds; calcium compounds; high-temperature superconductors; scanning electron microscopy; spray coating techniques; superconducting thin films; texture; thallium compounds; Ag; SEM; TlBaCaCuO; chemical compatibility; cubic texturized substrate; films; plate-like grains; silver tape substrates; two-step procedure; Aerosols; Critical current density; High temperature superconductors; Magnetic fields; Silver; Spraying; Substrates; Superconducting films; Superconductivity; X-ray diffraction;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
