In:
Applied Physics A, Springer Science and Business Media LLC, Vol. 128, No. 10 ( 2022-10)
Abstract:
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
Type of Medium:
Online Resource
ISSN:
0947-8396
,
1432-0630
DOI:
10.1007/s00339-022-06060-4
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2022
detail.hit.zdb_id:
1398311-8
detail.hit.zdb_id:
184232-8
detail.hit.zdb_id:
283365-7
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