Effect of MgB4 Addition on the Superconducting Properties of Polycrystalline MgB2

J. Ishiwata; M. Muralidhar; Kazuo Inoue; Masato Murakami

doi:10.1016/j.phpro.2015.05.124

Effect of MgB₄ Addition on the Superconducting Properties of Polycrystalline MgB₂

J. Ishiwata, M. Muralidhar, Kazuo Inoue, Masato Murakami

研究成果: Conference article › 査読

8 被引用数 (Scopus)

抄録

The objective of this work is to improve the flux pinning performance of bulk MgB₂ superconductors by dispersing nanometer-sized MgB₄ particles. The high quality MgB₄ material was produced, and the MgO rest in the powder was removed by HNO₃ (1 M) leaching. Several bulk polycrystalline samples were fabricated by means of the solid state reaction method with compositions MgB₂ + x wt% of MgB₄ (x=0, 2, 5, and 10) at 775^oC in pure argon atmosphere. X-ray diffraction indicated single phase and homogenous MgB₂ bulks when MgB₄ content was below 5wt%. The superconducting transitions were sharp at low MgB₄ concentrations. The critical current density, J_c, depend on the MgB₄ content in the MgB₂ composite. The MgB₂ sample with 2wt% of MgB₄ processed at 775^oC for 3 h showed the critical current density of 300 kA cm^-2 at 20 K in self field.

本文言語	English
ページ（範囲）	69-72
ページ数	4
ジャーナル	Physics Procedia
巻	65
DOI	https://doi.org/10.1016/j.phpro.2015.05.124
出版ステータス	Published - 2015
イベント	27th International Symposium on Superconductivity, ISS 2014 - Tokyo, Japan 継続期間: 2014 11月 25 → 2014 11月 27

ASJC Scopus subject areas

物理学および天文学（全般）

文献へのアクセス

10.1016/j.phpro.2015.05.124

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引用スタイル

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title = "Effect of MgB4 Addition on the Superconducting Properties of Polycrystalline MgB2",

abstract = "The objective of this work is to improve the flux pinning performance of bulk MgB2 superconductors by dispersing nanometer-sized MgB4 particles. The high quality MgB4 material was produced, and the MgO rest in the powder was removed by HNO3 (1 M) leaching. Several bulk polycrystalline samples were fabricated by means of the solid state reaction method with compositions MgB2 + x wt% of MgB4 (x=0, 2, 5, and 10) at 775oC in pure argon atmosphere. X-ray diffraction indicated single phase and homogenous MgB2 bulks when MgB4 content was below 5wt%. The superconducting transitions were sharp at low MgB4 concentrations. The critical current density, Jc, depend on the MgB4 content in the MgB2 composite. The MgB2 sample with 2wt% of MgB4 processed at 775oC for 3 h showed the critical current density of 300 kA cm-2 at 20 K in self field.",

keywords = "MgB, MgB, X-ray diffraction, critical current density, flux pinning, magnetization measurements",

author = "J. Ishiwata and M. Muralidhar and Kazuo Inoue and Masato Murakami",

year = "2015",

doi = "10.1016/j.phpro.2015.05.124",

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T1 - Effect of MgB4 Addition on the Superconducting Properties of Polycrystalline MgB2

AU - Ishiwata, J.

AU - Muralidhar, M.

AU - Inoue, Kazuo

AU - Murakami, Masato

PY - 2015

Y1 - 2015

N2 - The objective of this work is to improve the flux pinning performance of bulk MgB2 superconductors by dispersing nanometer-sized MgB4 particles. The high quality MgB4 material was produced, and the MgO rest in the powder was removed by HNO3 (1 M) leaching. Several bulk polycrystalline samples were fabricated by means of the solid state reaction method with compositions MgB2 + x wt% of MgB4 (x=0, 2, 5, and 10) at 775oC in pure argon atmosphere. X-ray diffraction indicated single phase and homogenous MgB2 bulks when MgB4 content was below 5wt%. The superconducting transitions were sharp at low MgB4 concentrations. The critical current density, Jc, depend on the MgB4 content in the MgB2 composite. The MgB2 sample with 2wt% of MgB4 processed at 775oC for 3 h showed the critical current density of 300 kA cm-2 at 20 K in self field.

AB - The objective of this work is to improve the flux pinning performance of bulk MgB2 superconductors by dispersing nanometer-sized MgB4 particles. The high quality MgB4 material was produced, and the MgO rest in the powder was removed by HNO3 (1 M) leaching. Several bulk polycrystalline samples were fabricated by means of the solid state reaction method with compositions MgB2 + x wt% of MgB4 (x=0, 2, 5, and 10) at 775oC in pure argon atmosphere. X-ray diffraction indicated single phase and homogenous MgB2 bulks when MgB4 content was below 5wt%. The superconducting transitions were sharp at low MgB4 concentrations. The critical current density, Jc, depend on the MgB4 content in the MgB2 composite. The MgB2 sample with 2wt% of MgB4 processed at 775oC for 3 h showed the critical current density of 300 kA cm-2 at 20 K in self field.

KW - MgB

KW - X-ray diffraction

KW - critical current density

KW - flux pinning

KW - magnetization measurements

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