Effect of Oxidizer Addition for Synthesis of Sr-Ca-Cu-O Superconductors

Abstract

Superconducting Sr-Ca-Cu-O samples were prepared by using a high-pressure technique. (Sr_0.7Ca_0.3)_0.9CuO_y powders with KClO₃ (0.00-6.00wt%) were sintered at 930°C for 20min. under 5GPa. The sample made from the powder containing 4.00wt% KClO₃ showed a diamagnetic signal of -6% full Meissner at 5K. However, the sample contained little “infinite-layer” phase. This result suggested the presence of a new superconducting phase in the Sr-Ca-Cu-O system.