Interfaces and surfaces of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>(YBCO)-Ag have been studied by SEM-EDXand AES.No effect of Ag on 123 structure in X-ray dif
Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperatureductility,stress rupture,especially,certain important mechanical properties,such a