6 Citations (Scopus)

Abstract

In previous studies, we found that bulk MgB2 contained numerous voids in various shapes and sizes. With the aim of improving the critical current density as well as the mechanical performance of the disk-shaped MgB2 bulk superconductors, we added Ag and optimized the processing conditions. The samples with varied Ag content from 0, 2, 4, 6, to 10wt% were synthesized in pure Ar atmosphere. Microstructural observation by scanning electron microscopy confirmed that metallic Ag particles are embedded in the void regions. Furthermore, atomic force microscopy indicated that silver-based MgB2 particles are of nanometer size. As a result, the critical current density (J c) values were improved with Ag addition as compared to pure MgB2 bulk. The sample with 4wt% Ag addition exhibited the highest J c of 293kA/cm2 at 20K and self field. The respective J c values at 10K were 400kA/cm2, 300kA/cm2, and 100kA/cm2 in self field, 1T and 2T. These values are the highest record values so far reported in bulk MgB2 materials.

Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
DOIs
Publication statusAccepted/In press - 2015 Jan 29

Fingerprint

Silver
Superconducting materials
voids
Atomic force microscopy
critical current
current density
Scanning electron microscopy
Processing
silver
atomic force microscopy
atmospheres
scanning electron microscopy

Keywords

  • AFM
  • Ag
  • Critical current density
  • MgB
  • SEM
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Critical current densities in Ag-added bulk MgB2",
abstract = "In previous studies, we found that bulk MgB2 contained numerous voids in various shapes and sizes. With the aim of improving the critical current density as well as the mechanical performance of the disk-shaped MgB2 bulk superconductors, we added Ag and optimized the processing conditions. The samples with varied Ag content from 0, 2, 4, 6, to 10wt{\%} were synthesized in pure Ar atmosphere. Microstructural observation by scanning electron microscopy confirmed that metallic Ag particles are embedded in the void regions. Furthermore, atomic force microscopy indicated that silver-based MgB2 particles are of nanometer size. As a result, the critical current density (J c) values were improved with Ag addition as compared to pure MgB2 bulk. The sample with 4wt{\%} Ag addition exhibited the highest J c of 293kA/cm2 at 20K and self field. The respective J c values at 10K were 400kA/cm2, 300kA/cm2, and 100kA/cm2 in self field, 1T and 2T. These values are the highest record values so far reported in bulk MgB2 materials.",
keywords = "AFM, Ag, Critical current density, MgB, SEM, X-ray diffraction",
author = "Muralidhar Miryala and Kazuo Inoue and Koblischka, {Michael Rudolf} and Masato Murakami",
year = "2015",
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language = "English",
journal = "Physica C: Superconductivity and its Applications",
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T1 - Critical current densities in Ag-added bulk MgB2

AU - Miryala, Muralidhar

AU - Inoue, Kazuo

AU - Koblischka, Michael Rudolf

AU - Murakami, Masato

PY - 2015/1/29

Y1 - 2015/1/29

N2 - In previous studies, we found that bulk MgB2 contained numerous voids in various shapes and sizes. With the aim of improving the critical current density as well as the mechanical performance of the disk-shaped MgB2 bulk superconductors, we added Ag and optimized the processing conditions. The samples with varied Ag content from 0, 2, 4, 6, to 10wt% were synthesized in pure Ar atmosphere. Microstructural observation by scanning electron microscopy confirmed that metallic Ag particles are embedded in the void regions. Furthermore, atomic force microscopy indicated that silver-based MgB2 particles are of nanometer size. As a result, the critical current density (J c) values were improved with Ag addition as compared to pure MgB2 bulk. The sample with 4wt% Ag addition exhibited the highest J c of 293kA/cm2 at 20K and self field. The respective J c values at 10K were 400kA/cm2, 300kA/cm2, and 100kA/cm2 in self field, 1T and 2T. These values are the highest record values so far reported in bulk MgB2 materials.

AB - In previous studies, we found that bulk MgB2 contained numerous voids in various shapes and sizes. With the aim of improving the critical current density as well as the mechanical performance of the disk-shaped MgB2 bulk superconductors, we added Ag and optimized the processing conditions. The samples with varied Ag content from 0, 2, 4, 6, to 10wt% were synthesized in pure Ar atmosphere. Microstructural observation by scanning electron microscopy confirmed that metallic Ag particles are embedded in the void regions. Furthermore, atomic force microscopy indicated that silver-based MgB2 particles are of nanometer size. As a result, the critical current density (J c) values were improved with Ag addition as compared to pure MgB2 bulk. The sample with 4wt% Ag addition exhibited the highest J c of 293kA/cm2 at 20K and self field. The respective J c values at 10K were 400kA/cm2, 300kA/cm2, and 100kA/cm2 in self field, 1T and 2T. These values are the highest record values so far reported in bulk MgB2 materials.

KW - AFM

KW - Ag

KW - Critical current density

KW - MgB

KW - SEM

KW - X-ray diffraction

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