The effect of Zr and Zn doping on transport critical current density and microstructure of filamentary Dy-Ba-Cu-O superconductor was investigated. Precursor filaments prepared by a solution spinning method were partially melted in atmosphere gas and oxygenated. Samples doped with Zr and Zn showed dense microstructure, and finely dispersed Dy2BaCuO5 particles in the Dy123 matrix were observed. It was found that the superconducting properties of Dy123 filaments doped with Zr and Zn were strongly dependent on the heating condition and the atmosphere. A high Jc value more than 104 A/cm2 with good reproducibility was obtained when these samples partially melted in flowing 20%O2 + Ar gas. By controlling the heat treatment condition, the maximum Jc value of 2.7 × 104 A/cm2 at 77 K and self-field were attained for the sample doped with 0.1 at % Zr. In the case of the sample doped with 0.1 at % Zn, the Jc value around 2.5 × 104 A/cm 2 was obtained, which was comparable with that of sample without doping. The relation between the field dependence of Jc and microstructure of the filamentary sample was also examined.
ASJC Scopus subject areas
- Physics and Astronomy(all)