Relationship Between Critical Current Properties and Microstructure of Er123 Melt-Solidified Bulks

Abstract

We report impurities doping effectors of Pt and/or CeO 2 of microstructures, critical temperatures and critical current density ( c ) in both -growth and -growth regions of the ErBa 2 Cu 3 O (Er123) melt-solidified bulks. The volume fraction of the Er 2 BaCuO 5 (Er211) particles in Er123 matrix was always lower in the -growth region than in the -growth region. However, the second peaks of c curves were more prominent in the -growth region and its maximum c value reached 53 kA cm 2 at 77 K under a magnetic field of 1 T for the bulk of the co-doping of 0.5 wt% Pt and 1.0 wt% CeO 2 . Whereas the Er211 particles were finely dispersed in Er123 matrix in each case of Pt-or CeO 2 -addition, the co-doping of Pr and CeO 2 showed most refined effect of the dispersion of Er211 particles. From the results of microstructures and c , c value at zero field was found to be systematically improved with the reduction of diameter of the Er211 particles.Index Terms-Addition of Pt and CeO 2 , -growth region and -growth region, finely dispersion of RE211, pushing and trapping.

Synthesis of ErBa2Cu3O7−δ Superconductor Solder for the Fabrication of Superconducting Joint between Gdba2cu3o7−δ Coated Conductor

“…In particular, ErBa 2 Cu 3 O 7−δ (Er123) has the highest optimized annealing temperature among RE123 compounds, which is strongly suggesting a drastic decrease in annealing time for the accomplishment of an optimally carrier-doped condition in Er123 compounds due to the large diffusion coefficient of oxygen [20]. There are only a few reports mentioned on Er123 powder [21][22][23][24][25][26], and none of them has systematic research on the synthesis of such compounds. The reported synthesis temperature even has some tens of degrees difference, which brings big confusion to other researchers.…”