Effect of silver solubility on microstructure and superconducting properties of YBa2Cu3-xAgxO7-δ superconductors

J. Joo, J. P. Singh, R. B. Poeppel, A. K. Gangopadhyay, T. O. Mason

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Abstract

The effect of silver (Ag) solubility on microstructure and superconducting properties of YBa2Cu3-xAgxO7-δ (0≤x≤0.5) superconductors has been evaluated. The solubility limit of Ag for copper sites in YBCO at ambient conditions (room temperature, atmospheric pressure) was evaluated to be x≅0.06. Analysis revealed the Ag content (x) of YBCO grains to be lower than the nominal Ag content (xn) used for fabrication, probably due to processing-related problems. Part of the Ag used for fabrication segregates on the YBCO grain boundaries. The segregated Ag particles are believed to pin YBCO grains, resulting in fine-grain microstructures. For low nominal Ag content, xn<0.2, critical current density (Jc) increased from 98 to 160 A/cm2 as a function of increasing Ag content. These improvements are believed to be due to the increased oxygen content and associated microstructural changes in the YBCO. For higher nominal Ag content, xn≳0.2, however, Jc decreased rapidly with the increasing Ag content due to the precipitation of nonsuperconducting phases.

Original languageEnglish
Pages (from-to)2351-2355
Number of pages5
JournalJournal of Applied Physics
Volume71
Issue number5
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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