Critical Current Density in Superconducting MgB2

Dou, S. X.; Pan, Alexey V.; Qin, M.J.; Silver, T.

doi:10.1007/3-540-27294-1_28

Cited by 1 publication

(2 citation statements)

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“…[14][15][16][17][18] To date, in situ sintering, including in situ PIT, from an elemental mixture of magnesium and boron has been used most commonly to fabricate MgB 2 superconductors in the form of bulks and wires and tapes. 19,20 However, the critical current density J c in MgB 2 superconductors synthesised by these techniques is still low compared with the full potential of these materials for practical applications. Relatively weak flux pinning in pure MgB 2 is a major limitation, which leads to a rapid degradation of J c as a function of applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the powder-in-tube (PIT) technique that has been used to fabricate Bi–Sr–Ca–Cu–O oxide superconductor has been employed in the fabrication of MgB 2 wires and tapes over recent years 1418 To date, in situ sintering, including in situ PIT, from an elemental mixture of magnesium and boron has been used most commonly to fabricate MgB 2 superconductors in the form of bulks and wires and tapes 19,20…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature synthesis of MgB₂ superconductors

Liu

2011

International Materials Reviews

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MgB 2 superconductors have the outstanding potential to be integrated into diverse commercial applications. However, the critical current density J c in MgB 2 is still smaller compared with expectations for an optimised material in these applications. Various flux pinning mechanisms are introduced into MgB 2 superconductors to improve J c by different methods, including irradiation, chemical doping and ball milling. On the other hand, these methods mainly focused on the enhancement of pinning, but always neglect or even worsen the grain connectivity, which limits the further improvement in J c . Recently, the low-temperature synthesised MgB 2 exhibits improved J c due to the increases in both the grain connectivity and flux pinning. Ball milling pre-treatment of original powders, usage of different Mg-based precursors and the additions of different metal or alloys are employed to enhance the sintering efficiency of MgB 2 at low temperature. Among them, the minor metal or alloy additions are proved to be the most convenient, effective and inexpensive way in accelerating the fabrication of MgB 2 superconductors at low temperature. Combining the advantages of metal-activated sintering and carbon doping, it is also proposed that the low-cost MgB 2 superconductors with further improved J c will be rapidly synthesised at low temperature with metal and carbon-based chemical co-doping.

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