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.
| Original language | English |
|---|---|
| Pages (from-to) | 2677-2681 |
| Number of pages | 5 |
| Journal | Journal of Superconductivity and Novel Magnetism |
| Volume | 31 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2018 Sep 1 |
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Keywords
- Critical current density (J)
- Flux pinning
- MgB
- Microstructure
- X-ray diffraction
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Progress in Critical Current Density (Jc) in Sintered MgB2 Bulks. / Miryala, Muralidhar; Murakami, Masato.
In: Journal of Superconductivity and Novel Magnetism, Vol. 31, No. 9, 01.09.2018, p. 2677-2681.Research output: Contribution to journal › Letter
}
TY - JOUR
T1 - Progress in Critical Current Density (Jc) in Sintered MgB2 Bulks
AU - Miryala, Muralidhar
AU - Murakami, Masato
PY - 2018/9/1
Y1 - 2018/9/1
N2 - 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.
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.
KW - Critical current density (J)
KW - Flux pinning
KW - MgB
KW - Microstructure
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=85049128858&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049128858&partnerID=8YFLogxK
U2 - 10.1007/s10948-018-4777-6
DO - 10.1007/s10948-018-4777-6
M3 - Letter
VL - 31
SP - 2677
EP - 2681
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 9
ER -