Superior critical current density obtained in MgB2 bulks through low-cost carbon-encapsulated boron powder

Barua, Shaon; Hossain, Md. Shahriar A.; Ma, Zongqing; Patel, Dipak; Mustapić, Mislav; Somer, M.; Acar, Selçuk; Kokal, Ilkin; Morawski, A.; Cetner, T.; Gajda, D.; Dou, Shi Xue

doi:10.1016/j.scriptamat.2015.04.003

Cited by 48 publications

(31 citation statements)

References 17 publications

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“…The (0 0 2) peak position stood unchanged for all samples studied. It indicates that carbon partly substitutes for boron in the lattice of MgB2, which is similar to earlier reports [14,21]. Table 1).…”

Section: Methodssupporting

confidence: 91%

“…Therefore, to reduce the cost of the boron and to optimize the high critical current density, several samples were produced mixing the crystalline boron and the 16.5% carbon-coated, nanometer-sized amorphous boron powders in varying ratios, i.e., 50:50, 60:40, 70:30, 80:20, 90:10. More details for the 16.5 wt% carbonencapsulated nano-boron powders (provided by PAVEZYUM, Advanced Chemicals, Turkey) can be found elsewhere [21]. The powder mixture was pressed into pellets of 20 mm in diameter and 4 mm in thickness using an uniaxial pressing machine.…”

Section: Methodsmentioning

confidence: 99%

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Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Hiroki

Muralidhar

Koblischka

et al. 2017

J. Phys.: Conf. Ser.

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Section: Methodssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Hiroki

Muralidhar

Koblischka

et al. 2017

J. Phys.: Conf. Ser.

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“…Undoped MgB 2 wires have very small values of critical parameters (J c , H irr , and H c2 ) in high magnetic fields, because this material has only a small amount of high-field pinning centers. Research has shown that high-field pinning centers in MgB 2 wires can result from substitution of C for B and dislocations [32,33,68,69]. Hot isostatic pressing (HIP) significantly increases the number of high-field pinning centers, e.g., increase in the density of dislocations, and accelerates the substitution of C for B, allowing to obtain a uniform distribution of pinning centers [27,31,35,36].…”

Section: Physical Properties and Pinning Centers In Mgb 2 Wiresmentioning

confidence: 99%

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Gajda

2018

J Low Temp Phys

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The main purpose of this article is to show an easier and more accurate method for analyzing high-field pinning centers. Previous methods did not allow for precise analysis and research on high-field pinning centers, they studied only the dominant pinning mechanism, and they required a maximum of pinning force (F pmax) to analyze pinning centers. The main advantage of this method can be used in samples without the maximum pinning force required by other methods to analyze the pinning mechanism. In addition, this method allows us to observe even small changes in the density of individual pinning centers. This method is based on analysis of critical current density values in different ranges of reduced magnetic field. The method of analysis of highfield pinning centers allows primarily to develop methods and directions for creation of high-field pinning centers. The surface pinning centers are strong pinning centers in low magnetic fields and very weak pinning centers in middle and high magnetic fields. Additionally, the analysis of pinning centers shows that dislocations, strains, substitutions in the crystal lattice, and precipitation inside the grains create strong pinning centers in high magnetic fields and very weak pinning centers in low and middle magnetic fields. Research indicates that strains, substitutions in the crystal lattice, and precipitates inside grains form pinning centers that operate in the high magnetic field range.

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“…Bovone et al [15] produced boron powder by magnesiothermic reduction of boron oxide in the lab, which proved to be an excellent precursor for MgB 2 wire manufacture independent of the applied technique. Furthermore, commercial carbon-coated amorphous boron powder brought along carbon doping and benefited the J c of the synthesized MgB 2 bulks with or without Cu doping [16,17].…”

Section: Introductionmentioning

confidence: 99%

Doping-Induced Isotopic Mg11B2 Bulk Superconductor for Fusion Application

et al. 2017

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Superconducting wires are widely used for fabricating magnetic coils in fusion reactors. Superconducting magnet system represents a key determinant of the thermal efficiency and the construction/operating costs of such a reactor. In consideration of the stability of 11 B against fast neutron irradiation and its lower induced radioactivation properties, MgB 2 superconductor with 11 B serving as the boron source is an alternative candidate for use in fusion reactors with a severe high neutron flux environment. In the present work, the glycine-doped Mg 11 B 2 bulk superconductor was synthesized from isotopic 11 B powder to enhance the high field properties. The critical current density was enhanced (10 3 A·cm −2 at 20 K and 5 T) over the entire field in contrast with the sample prepared from natural boron.

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Superior critical current density obtained in MgB2 bulks through low-cost carbon-encapsulated boron powder

Cited by 48 publications

References 17 publications

Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Doping-Induced Isotopic Mg11B2 Bulk Superconductor for Fusion Application

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Superior critical current density obtained in MgB2 bulks through low-cost carbon-encapsulated boron powder

Cited by 48 publications

References 17 publications

Production and Characterization of Bulk MgB2Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Production and Characterization of Bulk MgB2Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Doping-Induced Isotopic Mg11B2 Bulk Superconductor for Fusion Application

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Product

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Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

Production and Characterization of Bulk MgB₂Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders