Excess Mg in situ powder addition for enhancing critical current density of ex situ MgB2

Nurhidayah Mohd Hapipi, Soo Kien Chen, Abdul Halim Shaari, Mohd Mustafa Awang Kechik, Kean Pah Lim, Kar Ban Tan, Oon Jew Lee, Muralidhar Miryala

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this work, ex situ MgB2 bulks were added with (1.5 Mg + 2B) and sintered in an attempt to enhance its intergrain connectivity. The addition was varied within the range of 0–50 wt.%, and the sintering was undertaken at 700 °C, 800 °C, and 1000 °C, respectively, for 1 h. Superconducting critical temperature, Tc of the samples was determined to be around 38 K as shown by the temperature dependence of susceptibility measurement. It was found that critical current density, Jc increased with the increased amount of the addition. Jc was further enhanced to 2 × 104A cm2 (0 T, 20 K) as the sintering temperature was raised. The increase of Jc is due to improved grain coupling as a result of in situ formation of MgB2, which fills the voids and connects the ex situ MgB2 grains. Additionally, the grain coupling was further strengthened by solid-state self-sintering at higher temperatures. The increment of Jc was accompanied by a narrower width of double-step transition of Tc attributable to a more complete MgB2 phase formation of the samples as the sintering temperature was increased. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Article number913
JournalApplied Physics A: Materials Science and Processing
Issue number10
Publication statusPublished - 2022 Oct


  • Critical current density
  • Ex situ MgB
  • In situ MgB
  • Sintering
  • Superconducting transition

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science


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