Superconducting properties of MgB2 tapes and wires

Flükiger, R.; Suo, Hongli; Musolino, N.; Beneduce, C.; Toulemonde, Pierre; Lezza, P.

doi:10.1016/s0921-4534(02)02307-9

Cited by 242 publications

(196 citation statements)

References 46 publications

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“…28 Matsumoto et al 26 reported a similar to our record H c2 ͑0͒ value for a SiC-doped MgB 2 tape prepared by the powder-in-tube ͑PIT͒ method. These results correspond to a PIT tape sample that probably has some texturing [31][32][33] and the reported H c2 data were measured with the applied field parallel to the tape. Since we measured randomly oriented polycrystalline bulk samples, our results cannot be easily compared with those of Matsumoto et al…”

Section: Methodssupporting

confidence: 84%

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Serrano

Serquis

Dou

et al. 2008

Journal of Applied Physics

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This work describes in detail the simultaneous enhancement of the upper critical field ͑H c2 ͒ and the critical current density ͑J c ͒ of MgB 2 bulk samples doped with nano-SiC particles, as well as single-walled and double-walled ͑dw͒ carbon nanotubes ͑CNTs͒. The magnetization properties were examined in a superconducting quantum interference device magnetometer, and four-probe transport measurements were performed using a 50 T pulsed magnet to determine H c2 ͑T͒. We found that the J c enhancement is similar in all doped samples at 5 K but nano-SiC addition is more effective to improve the flux pinning in the high temperature range ͑T ജ 20 K͒; this improvement cannot solely be attributed to the C incorporation to the lattice but also to the presence of other types of defects ͑i.e., several kinds of nanoinclusions͒. CNTs produce a better C incorporation that is more effective to enhance H c2 ͓i.e., dwCNT-doped samples reached a record H c2 ͑0͒ϳ44 T value for bulk MgB 2 ͔. All the H c2 ͑T͒ curves obtained for different types of doping can be successfully described using a model for a two-gap superconductor in the dirty limit.

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Section: Methodssupporting

confidence: 84%

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Serrano

Serquis

Dou

et al. 2008

Journal of Applied Physics

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“…A ball milling process was adopted to further enhance the uniformity. [23][24][25] The mixed un-reacted powders were put into a metallic tube and then heat treated. The field dependence of the critical current measured by the standard four-probe method is shown in Figure 1a.…”

Section: Resultsmentioning

confidence: 99%

Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi

et al. 2012

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Increasing dissipation-free supercurrent has been the primary issue for practical application of superconducting wires. For magnesium diboride, MgB 2 , carbon is known to be the most effective dopant to enhance high-field properties. However, the critical role of carbon remains elusive, and also low-field critical current density has not been improved. Here, we have undertaken malic acid doping of MgB 2 and find that the microscopic origin for the enhancement of high-field properties is due to boron vacancies and associated stacking faults, as observed by high-resolution transmission electron microscopy and electron energy loss spectroscopy. The carbon from the malic acid almost uniformly encapsulates boron, preventing boron agglomeration and reducing porosity, as observed by three-dimensional X-ray tomography. The critical current density either exceeds or matches that of niobium titanium at 4.2 K. Our findings provide atomic-level insights, which could pave the way to further enhancement of the critical current density of MgB 2 up to the theoretical limit.

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“…Attempts to accomplish this have invoked the introduction of numerous techniques including chemical doping, [2][3][4][5][6] irradiation, 7 and various thermomechanical processing techniques. 8,9 Chemical doping is a simple and readily scalable technique. Since MgB 2 has a relatively large coherence length and small anisotropy, the fluxoids to be pinned are stringlike and amenable to pinning by inclusions and precipitates in the grains.…”

mentioning

confidence: 99%

Carbohydrate doping to enhance electromagnetic properties of MgB2 superconductors

Kim

Zhou

Hossain

et al. 2006

Applied Physics Letters

235

178

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The effect of carbohydrate doping on lattice parameters, microstructure, Tc, Jc, Hirr, and Hc2 of MgB2 has been studied. In this work the authors used malic acid as an example of carbohydrates as an additive to MgB2. The advantages of carbohydrate doping include homogeneous mixing of precursor powders, avoidance of expansive nanoadditives, production of highly reactive C, and significant enhancement in Jc, Hirr, and Hc2 of MgB2, compared to undoped samples. The Jc for MgB2+30wt% C4H6O5 sample was increased by a factor of 21 at 5K and 8T without degradation of self-field Jc.

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Superconducting properties of MgB2 tapes and wires

Cited by 242 publications

References 46 publications

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi

Carbohydrate doping to enhance electromagnetic properties of MgB2 superconductors

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