Improvement in the Performance of Bulk MgB2 Material through Optimization of Sintering Process

H. Kobayashi; M. Muralidhar; M. R. Koblischka; Kazuo Inoue; Masato Murakami

doi:10.1016/j.phpro.2015.05.127

Improvement in the Performance of Bulk MgB₂ Material through Optimization of Sintering Process

H. Kobayashi, M. Muralidhar, M. R. Koblischka, Kazuo Inoue, Masato Murakami

Research output: Contribution to journal › Conference article › peer-review

5 Citations (Scopus)

Abstract

Enhancement of the critical current density (J_c) in MgB₂ bulk material is very important for engineering applications. It has been found that the optimization of the sintering temperature leads to high J_c values in bulk MgB₂ material. In our recent work, the highest trapped field value was recorded in the sample sintered at 775^oC. The present investigation has focused on methods to improve further J_c values of the disk-shape bulk MgB₂ superconductors by optimizing sintering conditions. MgB₂ samples were subjected to a solid state reaction at 775, 780, 785, 795, 800 and 805^oC for 3 h in pure Ar atmosphere. XRD analysis showed that all the samples were single phase MgB₂. The magnetization measurements confirmed a sharp superconducting transition with onset T_c at around 38.7 K. Atomic force microscopy observation indicated that the number of nano meter size grains is more in samples processed 3 h at 805^oC has compared to the samples sintered at 775^oC. As a result, the highest J_c value of 245 kA/cm² at 20 K was obtained for the sample sintered at 805^oC for 3 h.

Original language	English
Pages (from-to)	73-76
Number of pages	4
Journal	Physics Procedia
Volume	65
DOIs	https://doi.org/10.1016/j.phpro.2015.05.127
Publication status	Published - 2015
Event	27th International Symposium on Superconductivity, ISS 2014 - Tokyo, Japan Duration: 2014 Nov 25 → 2014 Nov 27

Keywords

MgB2
X-ray diffraction
critical current density
magnetization measurements
sintering time

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1016/j.phpro.2015.05.127

Cite this

@article{06d6250481e04c86b78ef3d8e5384a7d,

title = "Improvement in the Performance of Bulk MgB2 Material through Optimization of Sintering Process",

abstract = "Enhancement of the critical current density (Jc) in MgB2 bulk material is very important for engineering applications. It has been found that the optimization of the sintering temperature leads to high Jc values in bulk MgB2 material. In our recent work, the highest trapped field value was recorded in the sample sintered at 775oC. The present investigation has focused on methods to improve further Jc values of the disk-shape bulk MgB2 superconductors by optimizing sintering conditions. MgB2 samples were subjected to a solid state reaction at 775, 780, 785, 795, 800 and 805oC for 3 h in pure Ar atmosphere. XRD analysis showed that all the samples were single phase MgB2. The magnetization measurements confirmed a sharp superconducting transition with onset Tc at around 38.7 K. Atomic force microscopy observation indicated that the number of nano meter size grains is more in samples processed 3 h at 805oC has compared to the samples sintered at 775oC. As a result, the highest Jc value of 245 kA/cm2 at 20 K was obtained for the sample sintered at 805oC for 3 h.",

keywords = "MgB2, X-ray diffraction, critical current density, magnetization measurements, sintering time",

author = "H. Kobayashi and M. Muralidhar and Koblischka, {M. R.} and Kazuo Inoue and Masato Murakami",

year = "2015",

doi = "10.1016/j.phpro.2015.05.127",

language = "English",

volume = "65",

pages = "73--76",

journal = "Physics Procedia",

issn = "1875-3884",

publisher = "Elsevier BV",

note = "27th International Symposium on Superconductivity, ISS 2014 ; Conference date: 25-11-2014 Through 27-11-2014",

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T1 - Improvement in the Performance of Bulk MgB2 Material through Optimization of Sintering Process

AU - Kobayashi, H.

AU - Muralidhar, M.

AU - Koblischka, M. R.

AU - Inoue, Kazuo

AU - Murakami, Masato

PY - 2015

Y1 - 2015

N2 - Enhancement of the critical current density (Jc) in MgB2 bulk material is very important for engineering applications. It has been found that the optimization of the sintering temperature leads to high Jc values in bulk MgB2 material. In our recent work, the highest trapped field value was recorded in the sample sintered at 775oC. The present investigation has focused on methods to improve further Jc values of the disk-shape bulk MgB2 superconductors by optimizing sintering conditions. MgB2 samples were subjected to a solid state reaction at 775, 780, 785, 795, 800 and 805oC for 3 h in pure Ar atmosphere. XRD analysis showed that all the samples were single phase MgB2. The magnetization measurements confirmed a sharp superconducting transition with onset Tc at around 38.7 K. Atomic force microscopy observation indicated that the number of nano meter size grains is more in samples processed 3 h at 805oC has compared to the samples sintered at 775oC. As a result, the highest Jc value of 245 kA/cm2 at 20 K was obtained for the sample sintered at 805oC for 3 h.

AB - Enhancement of the critical current density (Jc) in MgB2 bulk material is very important for engineering applications. It has been found that the optimization of the sintering temperature leads to high Jc values in bulk MgB2 material. In our recent work, the highest trapped field value was recorded in the sample sintered at 775oC. The present investigation has focused on methods to improve further Jc values of the disk-shape bulk MgB2 superconductors by optimizing sintering conditions. MgB2 samples were subjected to a solid state reaction at 775, 780, 785, 795, 800 and 805oC for 3 h in pure Ar atmosphere. XRD analysis showed that all the samples were single phase MgB2. The magnetization measurements confirmed a sharp superconducting transition with onset Tc at around 38.7 K. Atomic force microscopy observation indicated that the number of nano meter size grains is more in samples processed 3 h at 805oC has compared to the samples sintered at 775oC. As a result, the highest Jc value of 245 kA/cm2 at 20 K was obtained for the sample sintered at 805oC for 3 h.

KW - MgB2

KW - X-ray diffraction

KW - critical current density

KW - magnetization measurements

KW - sintering time

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