Uniformity of Coronene-Added MgB &lt;sub&gt;2&lt;/sub&gt; Superconducting Wires Fabricated Using an Internal Mg Diffusion Process

Ye, Shujun; Takigawa, H.; Matsumoto, Akiyoshi; Kumakura, Hiroaki

doi:10.1109/tasc.2015.2452222

Cited by 17 publications

(19 citation statements)

References 18 publications

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“…The IMD wires are known to have some nonuniformity in their transport properties due to different MgB 2 cross-sections along the wire length. 40 Therefore, a slight variation in the I c was observed between the wire and joint. The electric field versus current characteristics of the joint and wire in different magnetic fields at 20 K is shown in Figure 3d.…”

Section: Resultsmentioning

confidence: 85%

“…We expect that this joining approach could be used for joining unreacted or reacted multifilament IMD and in situ and ex situ processed MgB 2 conductors as well. The IMD wires are known to have some nonuniformity in their transport properties due to different MgB 2 cross-sections along the wire length . Therefore, a slight variation in the I c was observed between the wire and joint.…”

Section: Resultsmentioning

confidence: 90%

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Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

Patel

Matsumoto

Kumakura

et al. 2021

ACS Appl. Mater. Interfaces

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A superconducting joint of unreacted monofilament internal magnesium diffusion-processed magnesium diboride (MgB 2 ) wires was fabricated by exploiting the phenomenon of magnesium diffusion into the boron layer inside the superconducting joint. Unprecedentedly, the joint was able to carry an almost identical transport current compared to the bare wire in a 2−7 T magnetic field at 20 K. The joint also exhibited very low joint resistance of 2.01 × 10 −13 Ω in self-field at 20 K. Among commercially available superconductors, this work is the first to successfully realize a superconducting joint that is capable of transferring current from one conductor to another without any notable degradation under strong magnetic fields. This work demonstrates great potential to apply MgB 2 in a range of practical applications, where superconducting joints are essential.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 90%

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

Patel

Matsumoto

Kumakura

et al. 2021

ACS Appl. Mater. Interfaces

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“…The vapor-solid reacted samples achieved higher I c s (corresponding to higher J e s) than the liquid-solid reacted samples at all applied fields. The 4.2 K, 7 T I c s of the wires heat-treated at 625 °C for 8, 14 h reached 181 A and 180 A, respectively, which are higher than the I c of 157 A for the wire heat-treated at 675 °C/1 h. The J e s of these two vapor-solid reacted wires obtained 1.02 × 10 4 A cm −2 at 10 T and 4.2 K, which is a record for multifilamentary MgB 2 wires of any kind [13,14,16,35,36]. The I c /J e enhancements induced by the vapor-solid state reaction route are attributed to the fact that high layer J c s and large MgB 2 fill factors were simultaneously achieved by using vapor-solid reaction route.…”

Section: Transport J C S and N-valuesmentioning

confidence: 76%

High performance, advanced-internal-magnesium-infiltration (AIMI) MgB₂ wires processed using a vapor-solid reaction route

Wan

Sumption

Rindfleisch

et al. 2020

Supercond. Sci. Technol.

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MgB 2 superconducting wires made using a Mg infiltration method have reached a higher performance than either in-situ or ex-situ mixed powder based routes. Indeed, very high layer J c coupled with whole-strand J e (critical current per total strand cross section) exceeding 10 4 A cm −2 at 4.2 K, 10 T have been found for monocore MgB 2 wires. However, previous multicore infiltration route wires have not reached their potential for J e due to partially reacted and non uniform MgB 2 layers. This study shows that 18-core MgB 2 AIMI wires processed using a low temperature route can attain higher and more uniform J e values due to a more uniform MgB 2 reaction layer. The formation of fully reacted, uniform MgB 2 layers is attributed to the switch from a liquid-solid to a vapor-solid reaction route.

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“…Transmission electron microscopy (TEM) observation revealed that all boron particles were uniformly coated with carbon to a thickness of several nanometers . This coating imparted uniform superconducting properties to the MgB 2 over a large range of hundreds of meters . Our result suggests that the C 24 H 12 first melts above its melting point of 438 °C to infiltrates into boron particles without the need of a solvent, before the molten C 24 H 12 coating produces a well-matched interface with the particles due to the very high surface energy of the particles.…”

Section: Introductionmentioning

confidence: 74%

Solventless Synthesis of Core–Shell LiFePO₄/Carbon Composite for Lithium-Ion Battery Cathodes by Direct Pyrolysis of Coronene

Yasukawa

Song

et al. 2018

Ind. Eng. Chem. Res.

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LiFePO4 (LFP) as a cathode material for lithium-ion batteries (LIBs) requires the application of carbon composite to compensate its poor electrical conductivity. Thus, it is important to develop an efficient and cost-effective carbon composite process. This work demonstrates a new carbon coating (CC) method involving the direct solventless pyrolysis of the polycyclic aromatic hydrocarbon coronene (C24H12) as a means of coating LFP powder. The electrochemical properties of the resulting LIB cathodes were examined to find that the CLFP cathode exhibited a high specific capacity of 154 mAh/g at 0.05 C, which corresponds to 91% of the theoretical capacity of LFP (170 mAh/g), and LIB cells with the CLFP cathode showed rate capabilities and cycling performance comparable to those of commercial LIB cells. Due to the simple CC process and the associated formation mechanism, we anticipate that this method will have practical applications in the large-scale manufacture of LFP for LIB cathodes with low cost.

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Uniformity of Coronene-Added MgB <sub>2</sub> Superconducting Wires Fabricated Using an Internal Mg Diffusion Process

Cited by 17 publications

References 18 publications

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

High performance, advanced-internal-magnesium-infiltration (AIMI) MgB₂ wires processed using a vapor-solid reaction route

Solventless Synthesis of Core–Shell LiFePO₄/Carbon Composite for Lithium-Ion Battery Cathodes by Direct Pyrolysis of Coronene

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Uniformity of Coronene-Added MgB <sub>2</sub> Superconducting Wires Fabricated Using an Internal Mg Diffusion Process

Cited by 17 publications

References 18 publications

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

High performance, advanced-internal-magnesium-infiltration (AIMI) MgB2 wires processed using a vapor-solid reaction route

Solventless Synthesis of Core–Shell LiFePO4/Carbon Composite for Lithium-Ion Battery Cathodes by Direct Pyrolysis of Coronene

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Product

Resources

About

High performance, advanced-internal-magnesium-infiltration (AIMI) MgB₂ wires processed using a vapor-solid reaction route

Solventless Synthesis of Core–Shell LiFePO₄/Carbon Composite for Lithium-Ion Battery Cathodes by Direct Pyrolysis of Coronene