Progress in Critical Current Density (Jc) in Sintered MgB2 Bulks

研究成果: Letter

2 引用 (Scopus)

抄録

The present paper focuses on methods of further improving the flux pinning and critical current density of disk-shaped MgB2 bulk superconductors by adding excess Mg metal in combination with an optimum silver content and optimized processing conditions. Bulk MgB2 samples were produced by in situ solid-state reaction in Ar gas ambient using high purity commercial powders of Mg metal and 1.5 wt% carbon-coated amorphous B powders mixed in a fixed ratio of Mg/B = 1.1:2. Further, 4 wt% silver was added to improve flux pinning as well as mechanical performance of the bulk MgB2 material. The magnetization measurements confirmed a sharp superconducting transition with Tc,onset at around 37 K, which is only by 1 K lower than in bulk MgB2 material produced without carbon-coated amorphous boron. The critical current density (Jc) values significantly improved in the MgB2 material with 4 wt% of silver and 1.5 wt% of carbon-coated amorphous boron, sintered at 775 C for 3 h. At 20 K, this sample showed Jc at around 500 and 350 kA/cm2 in the self-field and 1 T, respectively, which makes it suitable for several industrial applications.

元の言語English
ページ(範囲)2677-2681
ページ数5
ジャーナルJournal of Superconductivity and Novel Magnetism
31
発行部数9
DOI
出版物ステータスPublished - 2018 9 1

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Silver
Flux pinning
critical current
Boron
Carbon
flux pinning
silver
current density
Powders
carbon
boron
Metals
Critical current density (superconductivity)
Solid state reactions
metals
Superconducting materials
Industrial applications
Magnetization
purity
Gases

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

これを引用

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abstract = "The present paper focuses on methods of further improving the flux pinning and critical current density of disk-shaped MgB2 bulk superconductors by adding excess Mg metal in combination with an optimum silver content and optimized processing conditions. Bulk MgB2 samples were produced by in situ solid-state reaction in Ar gas ambient using high purity commercial powders of Mg metal and 1.5 wt{\%} carbon-coated amorphous B powders mixed in a fixed ratio of Mg/B = 1.1:2. Further, 4 wt{\%} silver was added to improve flux pinning as well as mechanical performance of the bulk MgB2 material. The magnetization measurements confirmed a sharp superconducting transition with Tc,onset at around 37 K, which is only by 1 K lower than in bulk MgB2 material produced without carbon-coated amorphous boron. The critical current density (Jc) values significantly improved in the MgB2 material with 4 wt{\%} of silver and 1.5 wt{\%} of carbon-coated amorphous boron, sintered at 775 ∘C for 3 h. At 20 K, this sample showed Jc at around 500 and 350 kA/cm2 in the self-field and 1 T, respectively, which makes it suitable for several industrial applications.",
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AB - The present paper focuses on methods of further improving the flux pinning and critical current density of disk-shaped MgB2 bulk superconductors by adding excess Mg metal in combination with an optimum silver content and optimized processing conditions. Bulk MgB2 samples were produced by in situ solid-state reaction in Ar gas ambient using high purity commercial powders of Mg metal and 1.5 wt% carbon-coated amorphous B powders mixed in a fixed ratio of Mg/B = 1.1:2. Further, 4 wt% silver was added to improve flux pinning as well as mechanical performance of the bulk MgB2 material. The magnetization measurements confirmed a sharp superconducting transition with Tc,onset at around 37 K, which is only by 1 K lower than in bulk MgB2 material produced without carbon-coated amorphous boron. The critical current density (Jc) values significantly improved in the MgB2 material with 4 wt% of silver and 1.5 wt% of carbon-coated amorphous boron, sintered at 775 ∘C for 3 h. At 20 K, this sample showed Jc at around 500 and 350 kA/cm2 in the self-field and 1 T, respectively, which makes it suitable for several industrial applications.

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KW - Microstructure

KW - X-ray diffraction

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