Biomass-derived carbon doping to enhance the current carrying capacity and flux pinning of an isotopic Mg11B2 superconductor

Shahbazi, Mahboobeh; Hao, Yiqiang; Patel, Dipak; Hao, Liang; Yamauchi, Yusuke; Hossain, Md. Shahriar A.

doi:10.1016/j.jma.2022.01.010

Cited by 4 publications

(1 citation statement)

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“…For the MgB 2 superconductor, only the defects with dimensions comparable to the coherent length of the MgB 2 lattice can serve as effective pinning centers [11]. In-situ chemical doping is the most convenient method to introduce nanosized particles, and the widely used dopants include metals, C, and carbon-containing compounds [12][13][14][15]. However, the increase in the pinning effects was always accompanied by the deterioration of the grain connectivity, due to the uncontrollable agglomeration of additives or the second-phase particles.…”

Section: Introductionmentioning

confidence: 99%

Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂

Cui¹,

Cai²,

Li³

et al. 2023

Supercond. Sci. Technol.

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The present study reports a simple quenching method to simultaneously improve flux pinning and grain connectivity in polycrystalline H-doped MgB2, which was ex-situ synthesized at 350 oC under the H2 pressure of 3 MPa. Quenching prevented the phase transformation of β-Mg(BH4)2→α-Mg(BH4)2 upon cooling, and the dominant point-pinning effects originated from the self-generated nano-sized β-Mg(BH4)2 particles that were confined within the MgB2 grains. A semi-coherent relationship was found between MgB2(100) and Mg(BH4)2(—11—4) planes. Meanwhile, the precipitation-induced expansion of the MgB2 grains remained at room temperature, leading to an increasing number of contact points as well as grain connectivity. Compared with the un-doped MgB2, the quenched H-doped one exhibited enhanced critical current density over the entire field. These results are expected to guide the design of flux pinning centers for improving the Jc performance of standard type II superconductors.

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Section: Introductionmentioning

confidence: 99%

Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂

Cui¹,

Cai²,

Li³

et al. 2023

Supercond. Sci. Technol.

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Superconducting joints using reacted multifilament MgB2 wires: A technology toward cryogen-free MRI magnets

Patel,

Matsumoto,

Kumakura

et al. 2024

Journal of Magnesium and Alloys

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Impact of hair-derived carbon substitution on structural and superconducting properties of MgB2

Shahbazi,

Pannu,

Alarco

et al. 2023

AIP Advances

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This study presents a comprehensive analysis of the effects resulting from the substitution of biowaste-derived carbon-dot (CD) from human hair on structural and superconducting properties of MgB2. Syntheses of polycrystalline samples were accomplished through a standard solid-state reaction route. X-ray powder diffraction results confirm the formation of MgB2 as a primary phase in all samples and show the successful substitution of carbon for boron in MgB2. The critical current density, determined at 20 K and 4.5 T, for carbon-substituted MgB2 synthesized at 850 °C was enhanced by more than four times compared with unsubstituted MgB2. The observed improvement is due to the formation of efficient pinning centers resulting from the incorporation of carbon substituting for boron in MgB2. Furthermore, x-ray photoelectron spectroscopy (XPS) confirmed the presence of carbon bonding to boron in MgB2 synthesized with biowaste-derived CDs, indicating successful incorporation into the structure. Ultraviolet photoelectron spectroscopy (UPS) results show that the carbon-substituted MgB2 can lead to changes in the electronic band structure and values of work function. These changes significantly impact the properties of MgB2 materials, including superconducting transition temperature, upper critical field, and critical current density. The XPS and UPS experimental results are in good agreement with density functional theory calculations for MgB2 with and without carbon substitution.

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Biomass-derived carbon doping to enhance the current carrying capacity and flux pinning of an isotopic Mg11B2 superconductor

Cited by 4 publications

References 46 publications

Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂

Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂

Superconducting joints using reacted multifilament MgB2 wires: A technology toward cryogen-free MRI magnets

Impact of hair-derived carbon substitution on structural and superconducting properties of MgB2

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Biomass-derived carbon doping to enhance the current carrying capacity and flux pinning of an isotopic Mg11B2 superconductor

Cited by 4 publications

References 46 publications

Confinement of self-generated Mg(BH4)2 particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB2

Confinement of self-generated Mg(BH4)2 particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB2

Superconducting joints using reacted multifilament MgB2 wires: A technology toward cryogen-free MRI magnets

Impact of hair-derived carbon substitution on structural and superconducting properties of MgB2

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Product

Resources

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Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂

Confinement of self-generated Mg(BH₄)₂ particles for simultaneously enhanced flux pinning and grain connectivity in polycrystalline H-doped MgB₂