Critical Current Density of GdBa₂Cu₃O_7-x Ceramics

Abstract

The influences of the sintering temperatures in fabricating GdBa₂Cu₃O_7-x ceramics on the critical current densities were investigated. The critical current density measured by the resistive method (J_{c, res.}) showed a maximum value for the sample sintered at 930°C, while that estimated from the magnetization loop (J_{c, mag.}) increased monotonically with increase in sintering temperature. The relationship between the decrease in J_{c, res.} and the second phase at grain boundary was discussed.