Effects of silver addition on critical current densities and mechanical properties in bulk MgB<inf>2</inf>

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Abstract

The present study focuses on the effects of Ag addition on the critical current density (J<inf>c</inf>) and the mechanical performance of disk-shaped MgB<inf>2</inf> bulk superconductors. MgB<inf>2</inf> samples with varying Ag contents of 0, 2, 4, 6, 8, and 10 wt% were sintered at 775°C for 3h in Ar atmosphere. The J<inf>c</inf> values were improved with Ag addition, in that the sample with 4wt% Ag showed the highest J<inf>c</inf> value of 295kA cm<sup>-2</sup> at 20K and self-field. The respective J<inf>c</inf> values of the same sample were 430, 360, and 238kA cm<sup>-2</sup> in self-field, 0.5T, and 1T at 7K. These values are the highest so far reported in bulk MgB<inf>2</inf> materials. Scanning electron microscopy showed that silver and silver oxide particles are embedded in the voids. As a result, the mechanical performance at room temperature was improved with Ag addition. We also confirmed the presence of nanometer-sized AgMg<inf>3</inf> particles, which may be responsible for high flux pinning and improved mechanical performances. The disk-shaped MgB<inf>2</inf> bulk superconducting super-magnets are potential candidates for industrial applications, especially in the medical field. The flux pinning and the mechanical performance of MgB<inf>2</inf> bulk superconductors are dramatically improved by adding 4wt% Ag. The morphology of the Ag particles and their dispersion in the nanoscale can be visualized by SEM and AFM.

Original languageEnglish
Pages (from-to)831-838
Number of pages8
JournalAdvanced Engineering Materials
Volume17
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1

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Flux pinning
Silver
Superconducting materials
critical current
silver
mechanical properties
Silver oxides
current density
Mechanical properties
Scanning electron microscopy
flux pinning
Industrial applications
Magnets
silver oxides
scanning electron microscopy
voids
magnets
atomic force microscopy
atmospheres
Temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Effects of silver addition on critical current densities and mechanical properties in bulk MgB2",
abstract = "The present study focuses on the effects of Ag addition on the critical current density (Jc) and the mechanical performance of disk-shaped MgB2 bulk superconductors. MgB2 samples with varying Ag contents of 0, 2, 4, 6, 8, and 10 wt{\%} were sintered at 775°C for 3h in Ar atmosphere. The Jc values were improved with Ag addition, in that the sample with 4wt{\%} Ag showed the highest Jc value of 295kA cm-2 at 20K and self-field. The respective Jc values of the same sample were 430, 360, and 238kA cm-2 in self-field, 0.5T, and 1T at 7K. These values are the highest so far reported in bulk MgB2 materials. Scanning electron microscopy showed that silver and silver oxide particles are embedded in the voids. As a result, the mechanical performance at room temperature was improved with Ag addition. We also confirmed the presence of nanometer-sized AgMg3 particles, which may be responsible for high flux pinning and improved mechanical performances. The disk-shaped MgB2 bulk superconducting super-magnets are potential candidates for industrial applications, especially in the medical field. The flux pinning and the mechanical performance of MgB2 bulk superconductors are dramatically improved by adding 4wt{\%} Ag. The morphology of the Ag particles and their dispersion in the nanoscale can be visualized by SEM and AFM.",
author = "Muralidhar Miryala and Kazuo Inoue and Koblischka, {Michael Rudolf} and Akira Murakami and Masato Murakami",
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AU - Murakami, Masato

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