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

doi:10.1063/1.351088

Effect of silver solubility on microstructure and superconducting properties of YBa₂Cu_3-xAg_xO_7-δ superconductors

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

Northwestern University

Research output: Contribution to journal › Article

43 Citations (Scopus)

Abstract

The effect of silver (Ag) solubility on microstructure and superconducting properties of YBa₂Cu_3-xAg_xO_7-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 (x_n) 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, x_n<0.2, critical current density (J_c) 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, x_n≳0.2, however, J_c decreased rapidly with the increasing Ag content due to the precipitation of nonsuperconducting phases.

Original language	English
Pages (from-to)	2351-2355
Number of pages	5
Journal	Journal of Applied Physics
Volume	71
Issue number	5
DOIs	https://doi.org/10.1063/1.351088
Publication status	Published - 1992

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Physics and Astronomy(all)

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Joo, J., Singh, J. P., Poeppel, R. B., Gangopadhyay, A. K., & Mason, T. O. (1992). Effect of silver solubility on microstructure and superconducting properties of YBa₂Cu_3-xAg_xO_7-δ superconductors. Journal of Applied Physics, 71(5), 2351-2355. https://doi.org/10.1063/1.351088

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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.",

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AU - Gangopadhyay, A. K.

AU - Mason, T. O.

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N2 - 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.

AB - 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.

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