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

In this work, ex situ MgB 2 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 t...

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Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-10, Vol.128 (10), Article 913
Main Authors: Hapipi, Nurhidayah Mohd, Chen, Soo Kien, Shaari, Abdul Halim, Kechik, Mohd Mustafa Awang, Lim, Kean Pah, Tan, Kar Ban, Lee, Oon Jew, Miryala, Muralidhar
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Coupling
Critical current density
Critical temperature
Machines
Magnesium compounds
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Sintering
Sintering (powder metallurgy)
Surfaces and Interfaces
Temperature
Temperature dependence
Thin Films
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Summary:In this work, ex situ MgB 2 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, T c 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, J c increased with the increased amount of the addition. J c was further enhanced to 2 × 10 4 A cm 2 (0 T, 20 K) as the sintering temperature was raised. The increase of J c is due to improved grain coupling as a result of in situ formation of MgB 2, which fills the voids and connects the ex situ MgB 2 grains. Additionally, the grain coupling was further strengthened by solid-state self-sintering at higher temperatures. The increment of J c was accompanied by a narrower width of double-step transition of T c attributable to a more complete MgB 2 phase formation of the samples as the sintering temperature was increased. Graphical abstract
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-06060-4