Tl-based films grown on silver tape substrates

The Tl-based superconductors belong to potential candidates for high-curren t anti high-field applications. It is therefore of importance to prepare th em in the shape of tapes or wires. It seems, that silver tape is a very con venient material having suitable mechanical properties as well as chemical compatibility with superconducting films deposited using grown on top of th em. In our ease, Tl-based films were grown using a two-step procedure. Firs t, 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 w ith a source of Tl-oxide in the form of crude pellet. Results are reported on superconducting samples consisting so far of 2212, 2223 and 1223 phase m ixture. SEM observations revealed growing of plate-like grains. Metalurgica l processing of silver tape is underway as to obtain cubic texturized subst rate which should help to improve transport properties of the grown films.