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 journalConference articlepeer-review

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.

Original languageEnglish
Pages (from-to)102-105
Number of pages4
JournalPhysics Procedia
Volume58
DOIs
Publication statusPublished - 2014
Event26th International Symposium on Superconductivity, ISS 2013 - Tokyo, Japan
Duration: 2013 Nov 182013 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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