Substitution Effect of Sr for Ba of High-Tc Superconducting YBa2Cu3O7-y Ceramics

Abstract
Single phase Y(Ba1-xSrx)2Cu3O7-y [x=0, 0.1, 0.2, 0.3, 0.4] ceramics were fabricated. In the fracture surface of the ceramics, many prism crystals were observed. Superconducting transition temperature measured by the magnetic susceptibility was linearly lowered from 94 to 84 K with increasing x from 0 to 0.4 and all the lattice constants of orthorhombic unit cell became short.