Mechanism of Enhancement in Electromagnetic Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MgB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>by Nano SiC Doping

Dou, Shi Xue; Shcherbakova, Olga V; Yeoh, Wai Kong; Kim, Jung Ho; Soltanian, Saeid; Wang, Xiaotian; Senatore, Carmine; Flükiger, R.; Dhallé, M.; Husnjak, Ozren; Babić, Emil

doi:10.1103/physrevlett.98.097002

Cited by 255 publications

(192 citation statements)

References 31 publications

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“…The field dependence of the critical current measured by the standard four-probe method is shown in Figure 1a. Compared with other types of carbon doping, such as SiC doping, [26][27][28][29] the malic acid-doped sample studied in this work not only shows increased high-field critical current density, but also increased low-field critical current density, even comparable to that of NbTi, exceeding 10 5 A cm À2 at 4.2 K and 6 T. At higher temperature, for example at 20 K, the critical current density of SiC-doped samples has been reported to be decreased compared with the un-doped samples, but here, even at 20 K, the critical current density was increased.…”

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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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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“…GO doping decreased RRR by about 35%, introducing the defects through carbon substitution. [2][3][4][5][6][7]26 GO + Ag co-doping decreases the value of RRR by about 50%. Ag nanoparticles were dispersed on GO sheets, making them much more effective in creation of defects, in addition to the defects introduced by the C released from surface of GO sheets.…”

Section: Mgb 2 Characterizationmentioning

confidence: 99%

“…Considerable T C degradation 34 and the presence of impurity phases 35 can be observed. It is worth noting, however, that the reduction of T c due to nano-Ag addition is low compared to carbon dopants at the same level of doping 2,3,4 . The samples doped with 5wt.% nano-Ag and 2wt.% GO showed low resistivity values, however, the co-doped samples showed a much higher resistivity value.…”

Section: Mgb 2 Characterizationmentioning

confidence: 99%

“…The incorporation of nano size carbon containing dopants such as SiC, carbon nanotubes (CNT), malic acid, graphene, and graphene oxide into this superconductor has been reported widely as being an effective means of improving the superconducting properties [2][3][4][5][6] . Most carbon dopants, however, have adverse effects on the critical temperature (T c ) and the low field J C performance.…”

Section: Introductionmentioning

confidence: 99%

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Improvements in the Dispersion of Nanosilver in a MgB₂ Matrix through a Graphene Oxide Net

et al. 2015

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The effects of graphene oxide (GO) addition on the dispersion of nanosilver (Ag) in an MgB2 matrix were studied using bulk samples prepared through a diffusion process. The influence of the dispersion of Ag and Ag/GO particles on the critical current density ( Jc) of MgB2 was also investigated. GO has emerged as an excellent dopant which can significantly improve both the low-and high-field performance of MgB2 due to its capability to improve intergrain connectivity (GO) and inter-and intragrain pinning (GO and AgMg). The addition of nanosize Ag particles also results in an improvement of vortex pinning, and at the same time, it offers the advantage of preventing the loss of Mg during the sintering process. It is found that the dispersion of nanosilver in the presence of GO results in significant improvements in the critical current density in MgB2, particularly at high magnetic fields, due to improved intergrain connectivity and flux pinning. The use of the GO net as a platform for doping MgB2 in our case with Ag yielded a 10-fold-better critical current density ( Jc) than standard Ag doping at 9 T and 5 K. Even without sophisticated processes, we obtained a Jc result of 10 4 A/cm 2 at 9 T and 5 K, which is one of the best ever achieved. Corresponding author: mislav@uow.edu.au ABSTRACT:The effects of graphene oxide (GO) addition on the dispersion of nano-silver (Ag) in an MgB 2 matrix were studied using bulk samples prepared through a diffusion process. The influence of the dispersion of Ag and Ag/GO particles on the critical current density (J C ) of MgB 2 was also investigated. GO has emerged as an excellent dopant which can significantly improve both low-and high-field performance of MgB 2 due to its capability to improve inter-grain connectivity (GO), and inter-and intra-grain pinning (GO and AgMg). The addition of nano-size Ag particles also results in improvement of vortex pinning, and at the same time, it offers the advantage of preventing the loss of Mg during the sintering process. It is found that dispersion of nano-silver in the presence of GO results in significant improvements to the critical current density in MgB 2 , particularly at high magnetic fields, due to improved inter-grain connectivity and flux pinning. The use of the GO net as a platform for doping MgB 2 in our case with Ag, yielded a 10 times better critical current density (J C ) than standard Ag doping at 9 T and 5 K. Even without sophisticated processes, we obtained J C result of 10 4 A/cm 2 at 9 T and 5 K, which is one of the best ever achieved.

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“…The combination of both graphene and a superconductor into a composite has great potential for electrical devices and large scale applications. MgB 2 , a superconductor with a simple composition and two-gap feature has great potential for large current carrying applications, as demonstrated through a series of chemical dopings (Dou, S. X. et al 2007). In the case of graphene's, the strict two-dimensionality and its high electrical and thermal conductivities, make it an ideal candidate for integrating/doping into MgB 2 in order to improve the superconducting properties.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Properties of Graphene Doped Magnesium Diboride

Xu¹,

Li²,

Wang³

et al. 2011

Applications of High-Tc Superconductivity

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Mechanism of Enhancement in Electromagnetic Properties ofMgB2by Nano SiC Doping

Cited by 255 publications

References 31 publications

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

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

Improvements in the Dispersion of Nanosilver in a MgB₂ Matrix through a Graphene Oxide Net

Superconducting Properties of Graphene Doped Magnesium Diboride

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Mechanism of Enhancement in Electromagnetic Properties ofMgB2by Nano SiC Doping

Cited by 255 publications

References 31 publications

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

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

Improvements in the Dispersion of Nanosilver in a MgB2 Matrix through a Graphene Oxide Net

Superconducting Properties of Graphene Doped Magnesium Diboride

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Improvements in the Dispersion of Nanosilver in a MgB₂ Matrix through a Graphene Oxide Net