TY - JOUR
T1 - Excess Mg in situ powder addition for enhancing critical current density of ex situ MgB2
AU - Hapipi, Nurhidayah Mohd
AU - Chen, Soo Kien
AU - Shaari, Abdul Halim
AU - Kechik, Mohd Mustafa Awang
AU - Lim, Kean Pah
AU - Tan, Kar Ban
AU - Lee, Oon Jew
AU - Miryala, Muralidhar
N1 - Funding Information:
This research was funded by Universiti Putra Malaysia through the Putra Grant Scheme (Project Code: UPM.RMC.800-3/3/1/GPB/2020/9691400). N. M. Hapipi would like to acknowledge financial support from School of Graduate Studies, Universiti Putra Malaysia, through Graduate Research Fellowship (GRF) scholarship. This work was partly supported by Shibaura Institute of Technology (SIT) International Research Centre for Green Electronics and special funds for education and research budget code: 721MA56383.
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/10
Y1 - 2022/10
N2 - 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.]
AB - 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.]
KW - Critical current density
KW - Ex situ MgB
KW - In situ MgB
KW - Sintering
KW - Superconducting transition
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U2 - 10.1007/s00339-022-06060-4
DO - 10.1007/s00339-022-06060-4
M3 - Article
AN - SCOPUS:85138674038
SN - 0947-8396
VL - 128
JO - Applied Physics A: Materials Science and Processing
JF - Applied Physics A: Materials Science and Processing
IS - 10
M1 - 913
ER -