CORROSION BEHAVIOR OF HIGH-TEMPERATURE SUPERCONDUCTOR YBA2CU3-YAGYO7-X IN THE PRESENCE OF WATER

Because of the presence of water vapor, YBa2Cu3O7-x degrades easily in the atmosphere and thus very difficult to put it to practical use. Wh en Cu is partially substituted with Ag, however, there is not much a d ecrease in the critical temperature (T-c):T-c is 89 K compared with 91 K without substitution. Moreover, partial substitution of Ag increase s density, hardness, and superconducting particle size and above all i mproves considerably its stability in water. In this study YBa2Cu3O7-x and YBa2CU3-yAgyO7-x as a result of a partial substitution of Ag for Cu were synthesized by pyrophoric method. We investigated their stabil ities in water by XRD, SEM, and EPMA after immersing samples in distil led water for 3 hours. We can see that YBa2Cu2.94Ag0.05O7-x was the la rgest particle size and anticorrosion behavior.