Influence of Sm2O3 microalloying and Yb contamination on Y211 particles coarsening and superconducting properties of IG YBCO bulk superconductors

Single grain YBa2Cu3O7−x (YBCO or Y123) bulk superconductors were produced by an infiltration growth process. The solid phase precursor was prepared by solid state synthesis from Y2O3 + BaCuO2 powders. The influence of the addition of Sm2O3 and YB contamination from the substrate on the microstructu...

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Bibliographic Details
Published in:Superconductor science & technology 2018-04, Vol.31 (6)
Main Authors: Vojtkova, L, Diko, P, Kovac, J, Vojtko, M
Format: Article
Language:English
Subjects:
chemical pinning
infiltration growth
samarium addition
superconductors properties
synthesized solid phase
YBCO superconductors
ytterbium contamination
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Summary:Single grain YBa2Cu3O7−x (YBCO or Y123) bulk superconductors were produced by an infiltration growth process. The solid phase precursor was prepared by solid state synthesis from Y2O3 + BaCuO2 powders. The influence of the addition of Sm2O3 and YB contamination from the substrate on the microstructure and superconducting properties was analyzed. The dependences of Yb concentration on the distance from the bottom of the samples measured by energy dispersive spectroscopy microanalysis used in conjunction with scanning electron microscopy confirmed the contamination of the samples during the melting stage of the sample preparation. It is shown that the addition of Sm in low concentration and its combination with Yb from the substrate modify the coarsening of the Y211 particles as well as lead to the appearance of a secondary peak effect in the field dependences of the critical current density.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/aabb4e