CRYSTALLINE ALIGNMENT OF TL2BA2CACU2O-DELTA THIN-FILMS ANNEALED IN A SEALED CAPSULE

C-axis oriented Tl2Ba2CaCu2Odelta thin films have been prepared on MgO with good reproducibility by annealing them in an alumina capsule sea led with a gold gasket. The crystalline alignment of the thin films de pends on the annealing temperature, the Tl content of the pellets used for Tl compensation, and the him thickness. The electric properties o f the thin films depend on their alignment. The critical temperature T -c of c-asis oriented thin films is above 90 K, whereas that of random ly oriented thin films is below 85 K. The highest T-c is 108 K and the highest critical current density J(c) is 4.5 x 10(5) A/cm(2).