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Microstructure and Superconducting Properties of YBCO Bulk Superconductors with RE Substitutions

Abstract : The influence of RE (RE = Yb, 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 YBa 2 Cu 3 O 7-δ (Y-123), Y 2 O 3 and CeO 2 were enriched with different amounts of Yb2O3 and (or) Sm2O3 powders with the aim to increase critical current density, i.e., Jc, in self-field as well as in higher magnetic fields, by introducing additional pinning centers. YBCO bulk superconductors with RE 2 O 3 addition were prepared by the optimized top-seeded melt-growth process in the form of single grains. Microstructure analysis revealed that RE 2 O 3 addition leads to a higher amount of smaller Y 2 BaCuO 5 (Y-211) particles, which is related to high critical current density (J c i∼ 7 × 10 4 A/cm 2 ) of the samples with RE 2 O 3 addition in low magnetic fields. In this paper, the effect of RE 2 O 3 addition on Y-211 particle size, critical temperature Tc, and critical current density Jc is reported. © 2015 IEEE.
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D. Volochova, V. Antal, S. Piovarci, J. Kovac, M. Jirsa, et al.. Microstructure and Superconducting Properties of YBCO Bulk Superconductors with RE Substitutions. IEEE Transactions on Applied Superconductivity, Institute of Electrical and Electronics Engineers, 2016, 26 (3), pp.7433976. ⟨10.1109/TASC.2016.2542281⟩. ⟨hal-02184744⟩



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