Solution-processed nanometers thick amorphous carbon-coated boron as an efficient precursor for high-field performance of MgB2

Ranot, Mahipal; Jang, Se Hoon; Shinde, K.P.; Sinha, B. B.; Bhardwaj, Asha; Oh, Youngseok; Kang, Seong-Hoon; Chung, Kookchae

doi:10.1016/j.jallcom.2017.07.028

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…Li et al [91] fabricated amorphous layer surrounding Nb nanograins by a ball-milling process, which may also be used to get a homogeneous carbon-layer-encapsulated boron. A solution process to prepare 3-4-nm-thin carbon layer encapsulated boron has been proposed by Ranot et al [39]. Polymethyl methacrylate (PMMA) polymer is first dissolved in N,N-dimethyl formamide (DMF) solution.…”

Section: Graphene-related Materials Dopingmentioning

confidence: 99%

“…Carbon-containing materials doping effects on H c2 , flux pinning force, and connectivity are reviewed in part 2, including SiC [13][14][15][16][17][18][19][20][21][22][23][24], organics [25][26][27][28][29][30][31][32], graphene, and graphene oxide [33][34][35][36][37][38] as well as preparing MgB 2 using carbon-encapsulated boron [39][40][41][42][43][44][45][46][47]. It has been proved that carbon has the tendency to substitute on boron site in the lattice rather than to form solid solution with MgB 2 [48].…”

Section: Introductionmentioning

confidence: 99%

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Research Progress of Electromagnetic Properties of MgB2 Induced by Carbon-Containing Materials Addition and Process Techniques

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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For the high transition temperature (T c ) and low cost taking both raw materials and fabrication process into account, MgB 2 has been a competitive candidate to replace the conventional NiTi superconductor for high-temperature application in fault current limiters, transformers, motors, magnetic resonance imaging, adiabatic demagnetization refrigerators, generators, etc. The carbon-containing materials addition induced high critical current density (J c ) is reviewed based on their influences on the upper critical field (H c2 ), flux pinning force, and connectivity. The doping effects were compared in the overview focusing on SiC, organic dopants, and graphene-related dopants. SiC doping is featured for the high-field critical current density, which is caused by the increased H c2 attributed to the substitution of carbon on boron site and the strong flux pinning force offered by the nanosized secondary phases in the MgB 2 matrix. Organic dopants have the advantage over SiC dopant for their relatively homogeneous distribution in the MgB 2 matrix based on wet mixing of the organics and the raw boron powders. Low doping level of two-dimensional materials can improve the superconducting properties in all measured fields because of the combined advantages of carbon substitution effect and grain connectivity. MgB 2 fabricated with carbon-encapsulated boron also introduces strong flux pinning centers in MgB 2 , which show weak destruction of the connectivity of the MgB 2 grains as reflected by the low-magnetic-supercurrent behavior. High-pressure treatment and diffusion method can fabricate highdensity MgB 2 superconductors with better connectivity and increase the J c compared with the in situ and ex situ methods. KeywordsCritical current density (J c ) • Flux pinning • Doping • 2D flux pinning centers * Chuanbing Cai

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Section: Graphene-related Materials Dopingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research Progress of Electromagnetic Properties of MgB2 Induced by Carbon-Containing Materials Addition and Process Techniques

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…The measured superconducting critical temperature, room temperature resistivity (RTR), crystal lattice parameters (LP) of doped MgB 2 superconductor and residual resistivity ratio (RRR) employed in developing the SINE-ELM-RTR model, SINE-ELM-LP model and SIG-ELM-RRR model were obtained from the literature [1][2][3][10][11][12][13]15,. While the presence of dopants in MgB 2 superconductor results in distortion, with which the developed SINE-ELM-LP model estimates the superconducting critical temperature, RTR and RRR measure the degree of disorder and impurity scattering resulting from the introduced dopants.…”

Section: Physical Description Of the Datasetmentioning

confidence: 99%

“…Apart from lattice distortion, incorporation of foreign materials into MgB 2 superconductor by doping introduces disorder, as well as lattice impurity scattering, which becomes manifested through electrical resistivity enhancement [10]. Resistivity is also affected by the defects present inside the grains, while the value is altered when foreign material, such as carbon, is substituted into atomic sites containing boron atoms [11]. Concentration of dopants significantly affects the value of resistivity residual ratio since lattice distortion created by dopants enhances the impurity scattering [12].…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the sample crystallinity and the extent of MgB 2 inter-grain connectivity are reflected by the values of room temperature resistivity (RTR) and resistivity residual ratio (RRR) [15]. The lattice parameter reduction, as well as the impurity scattering due to the incorporated dopants, influences superconducting bonds in MgB 2 superconductor since the mean free path becomes shortened and, ultimately, leads to a decrease in the coherence length [11]. The employed methodology in this work physically relates the descriptors with the superconducting critical temperature while the nature of the relationship is established using extreme learning machine [16].…”

Section: Introductionmentioning

confidence: 99%

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Extreme Learning Machine Approach to Modeling the Superconducting Critical Temperature of Doped MgB2 Superconductor

Olatunji

Owolabi

2022

Crystals

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Magnesium diboride (MgB2) superconductor combines many unique features such as transparency of its grain boundaries to super-current flow, large coherence length, absence of weak links and small anisotropy. Doping is one of the mechanisms for enhancing these features, as well as the superconducting critical temperature, of the compound. During the process of doping, the MgB2 superconductor structural lattice is often distorted while the room temperature resistivity, as well as residual resistivity ratio, contributes to the impurity scattering in the lattice of doped samples. This work develops three extreme learning machine (ELM)-based empirical models for determining MgB2 superconducting critical temperature (TC) using structural distortion as contained in lattice parameters (LP) of doped superconductor, room temperature resistivity (RTR) and residual resistivity ratio (RRR) as descriptors. The developed models are compared with nine different existing models in the literature using different performance metrics and show superior performance over the existing models. The developed SINE-ELM-RTR model performs better than Intikhab et.al (2021)_linear model, Intikhab et.al (2021)_Exponential model, Intikhab et.al (2021)_Quadratic model, HGA-SVR-RRR(2021) model and HGA-SVR-CLD(2021) model with a performance improvement of 32.67%, 29.56%, 20.04%, 8.82% and 13.51%, respectively, on the basis of the coefficient of correlation. The established empirical relationships in this contribution will be of immense significance for quick estimation of the influence of dopants on superconducting transition temperature of MgB2 superconductor without the need for sophisticated equipment while preserving the experimental precision.

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Novel ultra-sonic boron refinement in distilled water for cost-efficient fabrication of MgB2 bulk ceramic superconductors

Arvapalli¹,

Muralidhar²,

Sakai³

et al. 2022

Ceramics International

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Solution-processed nanometers thick amorphous carbon-coated boron as an efficient precursor for high-field performance of MgB2

Cited by 14 publications

References 31 publications

Research Progress of Electromagnetic Properties of MgB2 Induced by Carbon-Containing Materials Addition and Process Techniques

Research Progress of Electromagnetic Properties of MgB2 Induced by Carbon-Containing Materials Addition and Process Techniques

Extreme Learning Machine Approach to Modeling the Superconducting Critical Temperature of Doped MgB2 Superconductor

Novel ultra-sonic boron refinement in distilled water for cost-efficient fabrication of MgB2 bulk ceramic superconductors

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