Ceramics-Silikáty 49 (1) 19-22 (2005)

YBa₂Cu₃O_7-x MELT-TEXTURED THICK FILMS DEPOSITED ON ALUMINA-TOUGHENED ZIRCONIA SUBSTRATE

G. Plesch, J. Kliment, P. Billik, A. Cigáň, J. Maňka , J. Plewa, H. Altenburg

Melt textured superconducting YBCO films with an approximate thickness of 50-120 µm and Tc(0) values ranging between 86.5 and 88.5 K have been prepared on polycrystalline yttria-stabilized zirconia substrate, toughened by 20 wt.% Al₂O₃. Between the substrate and superconducting film an interface layer was formed. Their AC and DC magnetization characteristics were measured and the values of the magnetic penetration field Hp1 were estimated. The penetration field Hp1 of 2.7 kA m^-1 was obtained for the thinner film deposited with a higher spin coating rate, while for the thicker film deposited with a lower spin coating rate Hp1 = 4.4 kA m^-1. Repeated temperature cycling between room and liquid nitrogen temperatures and corresponding measurement of the magnetization hysteresis curves reveal the significant decrease of the grain superconducting pro-perties caused probably by arising cracks.

Keywords: YBa₂Cu₃O₇ (YBCO), Thick films, Melt textured, Alumina toughened YSZ substrate