Improvements of microstructural and superconducting properties of Ag-Bi2Sr2CaCu2Ox screen-printed tape by controlled oxygen partial pressure during cooling procedure

9 August 1993

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 63 (6) , 833-835
https://doi.org/10.1063/1.109897

Abstract

The effect of different cooling procedures, after sintering, on the microstructural and superconducting properties of Bi₂Sr₂CaCu₂O_x (B‐2212) screen‐printed tapes has been investigated. It was found that the amorphous phase originally present in grain boundaries at the sintering temperature undergoes a conversion to the Bi‐2212 phase during slow cooling. However, the excess oxygen absorbed during slow cooling (in 21% oxygen) disturbs the order and ordering process of Bi‐2212 crystals, but if the slow cooling process is conducted under monotonically reduced oxygen partial pressure, to ensure that the optimum oxidation state at sintering temperature of the Bi‐2212 phase can be retained during the cooling procedure, tapes are then characterized by narrow grain boundaries and the highest J_c value ≳10⁴ A/cm² at 77 K and 0 T.

Keywords

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