Effects of glucose doping on the MgB2 superconductors using cheap crystalline boron

Parakkandy, Jafar M.; Shahabuddin, Mohammed; Shah, M. Shahabuddin; Alzayed, Nasser S.; Qaid, Salem A. S.; Madhar, Niyaz Ahmad; Ramay, Shahid M.; Shar, Muhammad Ali

doi:10.1016/j.physc.2015.10.003

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…It appears that the a-axis parameter significantly decreases with increasing initial K 2 CO 3 content, whereas the caxis parameter only slightly increases. This behavior is typical for the effect of carbon doping on boron sites in the MgB 2 structure [11][12][13]. According to the relation established by Lee et al [28] on the basis of a systematic study of C-substituted MgB 2 single crystals, the amount of carbon…”

Section: Resultsmentioning

confidence: 88%

“…For several applications involving high magnetic fields such as magnets [1,2], energy storage devices [3,4], high power cables [5], etc., exploiting the superconducting properties of MgB 2 on a large-scale commercial level requires further improvements of the critical current density (j c ) performance of wires and bulk samples, because this parameter tends to be severely suppressed as soon as a magnetic field is acting on the material. This is especially important if MgB 2 is meant to be used at an operation temperature of 20 K. Besides the addition of nanoparticles acting as flux pinning centers [6][7][8], doping on the boron sites in the MgB 2 crystal lattice has been found to be effective in enhancing the pinning force and hence the j c of MgB 2 under high magnetic fields [9][10][11][12][13][14][15][16]. It must however be underscored that only carbon substitution for boron results in improvements, whereas Al, the only other element able to substitute for B to a significant extent, induces adverse effects due to the different influence of these elements on H c2 [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, carbon doping generally results in a lowering of the j c values under self-field and moderate applied magnetic field conditions [11][12][13]. For this reason, research activities are still ongoing in order to find ways of improving the j c performance of MgB 2 samples at high magnetic fields without compromising their properties at lower fields.…”

Section: Introductionmentioning

confidence: 99%

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Critical current density improvements in MgB 2 superconducting bulk samples by K 2 CO 3 additions

Grivel

2018

Physica C: Superconductivity and its Applications

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Critical current density improvements in MgB 2 superconducting bulk samples by K 2 CO 3 additions

Grivel

2018

Physica C: Superconductivity and its Applications

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“…As seen in the and c parameters. This increase may be characteristic to the reformed intra-grain and inter-grain properties in MgB2 superconducting materials [30] . Behaviour of the bare and nano hBN added MgB2 samples may be explained by the improvement of crystallinity with increasing the annealing time but becomes disadvantageous for 4 hours annealing duration.…”

Section: Resultsmentioning

confidence: 87%

Nanoscience and Nanotechnology

Chattopadhyay¹,

Ghosh²

2018

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Aim: In the present study, I have investigated the effect of different annealing time durations of 0.5h, 1h, 2h and 4h (annealing temperature at 700 o C) on the electrical, micro structural and superconducting properties of the nano hexagonal boron nitride (hBN) added/doping magnesium diboride (MgB2) superconducting samples. The aim of this work, hBN added MgB2 superconducting bulk samples are determined to find out the optimum sintering time, also investigated how BN addition effects the optimum fabrication conditions. These superconducting samples were prepared by the conventional solid-state reaction method. Experimental techniques of X-ray diffraction (XRD) were used for structural and microstructural examinations. Critical transition temperatures, difference between Tc-onset and Tc-offset, a and c lattice parameter, grain size, bulk density, residual resistivity ratios (RR) and cross-sectional area fractions (AF) of the pure and nano-hBN added MgB2 materials are obtained using a cryostat equipped with a superconducting magnet. All the experimental results notice that the characteristic features improve regularly with the increment in sintering time durations.

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“…This enhancement is possible due to the lack of a weak link and the two-gap nature of MgB 2 [3,4]. In particular, C additives from different sources have been confirmed to be effective [5,6,7,8,9,10,11,12,13]. The use of carbon nano tubes (CNTs) is significantly attractive in view of their unusual electrical, mechanical, and thermal properties [14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Uniform Dispersion and Exfoliation of Multi-Walled Carbon Nanotubes in CNT-MgB2 Superconductor Composites Using Surfactants

et al. 2019

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We developed a novel yet commercially viable strategy of synthesizing superior high-TC superconducting composites by dispersing fully exfoliated carbon nanotubes (CNTs) uniformly throughout the grain of CNT-MgB2 composites. First, we optimized the amount of the surfactant required to produce a highly stable and homogeneous colloidal suspension of CNTs. This amount was found to be 1/8th of the amount of CNTs. Second, we prepared a homogeneous CNT-B mixture by adding amorphous nano-boron (B) to the colloidal CNT suspension. Next, two different MgB2 synthesis routes were explored. In one case, we mixed an appropriate amount of Mg in the CNT-B mixture and carried out sintering. In the second case, the CNT-B mixture was heat treated at 500 °C, prior to mixing with Mg and sintering to form CNT-MgB2. Both kinds of samples were rigorously characterized to obtain an insight into their properties. The direct synthesis route shows a clear exfoliation and uniform dispersion of CNTs with a critical current density (JC) of 104 A/cm2 at 3.5 T and 20 K, which is useful for the application in magnetic resonance imaging MRI magnet operating with a cryogen free cooler. Our JC(H) result is 10 times higher than that of the pure sample. By contrast, the performance of the sample subjected to heat processing before sintering was severely compromised given the formation of MgO. Despite its simplicity, the direct synthesis route can be used for the cost-effective fabrication of CNT–MgB2 superconducting composites.

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Effects of glucose doping on the MgB2 superconductors using cheap crystalline boron

Cited by 11 publications

References 19 publications

Critical current density improvements in MgB 2 superconducting bulk samples by K 2 CO 3 additions

Critical current density improvements in MgB 2 superconducting bulk samples by K 2 CO 3 additions

Nanoscience and Nanotechnology

Uniform Dispersion and Exfoliation of Multi-Walled Carbon Nanotubes in CNT-MgB2 Superconductor Composites Using Surfactants

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