Abstract
The influence of RE ( $\text{RE} = \text{Yb}, \text{Sm}$ ) substitutions on the microstructure and superconducting properties of Y-Ba-Cu-O (YBCO) bulk superconductors has been studied for different RE concentrations and their combinations. Precursor powders $\text{YBa}_{2}\text{Cu}_{3}\text{O}_{7-\delta}$ (Y-123), Y2O3 and CeO2 were enriched with different amounts of Yb2O3 and (or) Sm2O3 powders with the aim to increase critical current density, i.e., $J_{c}$ , in self-field as well as in higher magnetic fields, by introducing additional pinning centers. YBCO bulk superconductors with RE2O3 addition were prepared by the optimized top-seeded melt-growth process in the form of single grains. Microstructure analysis revealed that RE2O3 addition leads to a higher amount of smaller Y2BaCuO5 (Y-211) particles, which is related to high critical current density $(J_{c} \sim 7 \times 10^{4} \text{A/cm}^{2})$ of the samples with RE2O3 addition in low magnetic fields. In this paper, the effect of RE2O3 addition on Y-211 particle size, critical temperature $T_{c}$ , and critical current density $J_{c}$ is reported.
Published Version
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