Effect of Sintering Time on the Optimal Synthesis Condition in MgB2

J. Ishiwata; M. Muralidhar; N. Koshizuka; K. Inoue; M. Murakami

doi:10.1016/j.phpro.2014.09.037

Effect of Sintering Time on the Optimal Synthesis Condition in MgB₂

J. Ishiwata, M. Muralidhar, N. Koshizuka, K. Inoue, M. Murakami

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

Abstract

The present investigation has focused on methods to improve the critical current density (J_c) of the disk-shape bulk MgB₂ superconductor by optimizing sintering conditions. The samples have been synthesized using a two-step process. The samples are sintered at 775^oC for 3 h in pure argon atmosphere, followed by re-sintering at 660^oC for 24 to 100 hours. X-ray diffraction showed that all the samples re-sintered are single phase and homogenous. The magnetization measurements confirm a sharp superconducting transition with T_c (onset) at around 37 K. The critical current density (J_c) for MgB₂ samples increases with increasing the re-sintering time at 660 ^oC, in that the highest J_c value of 170 kA/cm² at 20 K was obtained in the sample re-sintered at 660 ^oC for 100 h.

Original language	English
Pages (from-to)	102-105
Number of pages	4
Journal	Physics Procedia
Volume	58
DOIs	https://doi.org/10.1016/j.phpro.2014.09.037
Publication status	Published - 2014
Event	26th International Symposium on Superconductivity, ISS 2013 - Tokyo, Japan Duration: 2013 Nov 18 → 2013 Nov 20

Keywords

MgB
critical current density (J)
two-step process
x-ray diffraction

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{29786857e7c5486f9e6c2fd01c4f663b,

title = "Effect of Sintering Time on the Optimal Synthesis Condition in MgB2",

abstract = "The present investigation has focused on methods to improve the critical current density (Jc) of the disk-shape bulk MgB2 superconductor by optimizing sintering conditions. The samples have been synthesized using a two-step process. The samples are sintered at 775oC for 3 h in pure argon atmosphere, followed by re-sintering at 660oC for 24 to 100 hours. X-ray diffraction showed that all the samples re-sintered are single phase and homogenous. The magnetization measurements confirm a sharp superconducting transition with Tc (onset) at around 37 K. The critical current density (Jc) for MgB2 samples increases with increasing the re-sintering time at 660 oC, in that the highest Jc value of 170 kA/cm2 at 20 K was obtained in the sample re-sintered at 660 oC for 100 h.",

keywords = "MgB, critical current density (J), two-step process, x-ray diffraction",

author = "J. Ishiwata and M. Muralidhar and N. Koshizuka and K. Inoue and M. Murakami",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.; 26th International Symposium on Superconductivity, ISS 2013 ; Conference date: 18-11-2013 Through 20-11-2013",

year = "2014",

doi = "10.1016/j.phpro.2014.09.037",

language = "English",

volume = "58",

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journal = "Physics Procedia",

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TY - JOUR

T1 - Effect of Sintering Time on the Optimal Synthesis Condition in MgB2

AU - Ishiwata, J.

AU - Muralidhar, M.

AU - Koshizuka, N.

AU - Inoue, K.

AU - Murakami, M.

PY - 2014

Y1 - 2014

N2 - The present investigation has focused on methods to improve the critical current density (Jc) of the disk-shape bulk MgB2 superconductor by optimizing sintering conditions. The samples have been synthesized using a two-step process. The samples are sintered at 775oC for 3 h in pure argon atmosphere, followed by re-sintering at 660oC for 24 to 100 hours. X-ray diffraction showed that all the samples re-sintered are single phase and homogenous. The magnetization measurements confirm a sharp superconducting transition with Tc (onset) at around 37 K. The critical current density (Jc) for MgB2 samples increases with increasing the re-sintering time at 660 oC, in that the highest Jc value of 170 kA/cm2 at 20 K was obtained in the sample re-sintered at 660 oC for 100 h.

AB - The present investigation has focused on methods to improve the critical current density (Jc) of the disk-shape bulk MgB2 superconductor by optimizing sintering conditions. The samples have been synthesized using a two-step process. The samples are sintered at 775oC for 3 h in pure argon atmosphere, followed by re-sintering at 660oC for 24 to 100 hours. X-ray diffraction showed that all the samples re-sintered are single phase and homogenous. The magnetization measurements confirm a sharp superconducting transition with Tc (onset) at around 37 K. The critical current density (Jc) for MgB2 samples increases with increasing the re-sintering time at 660 oC, in that the highest Jc value of 170 kA/cm2 at 20 K was obtained in the sample re-sintered at 660 oC for 100 h.

KW - MgB

KW - critical current density (J)

KW - two-step process

KW - x-ray diffraction

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JF - Physics Procedia

SN - 1875-3884

T2 - 26th International Symposium on Superconductivity, ISS 2013

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