STUDIES ON THE STABILITY AND STRUCTURE OF HIGH T-C Y-BA-CU-O SUPERCONDUCTOR WITH F-ELEMENT

The samples of high T-c Y-Ba-Cu-O superconductor with F element were p repared by using BaF2, CuF2, YF3 instead of BaO, CuO, Y2O3 respectivel y, The substitutive ratio was about 45%, The zero-resistance temperatu re was 82.5 similar to 93.5 K, By means of X-ray powder diffraction, i nfrared spectroscopy, difference thermal analysis, the structure and s tability of the samples were investigated, The preliminary results sho w that only small amount of F element entered the superconductive phas e, and made the stability of the high T-c Y-Ba-Cu-O superconductor wit h F element increasing greatly in the environment of water vapor and c arbon dioxide.