Thermodynamic and kinetic evidence for MgO formation and pinning behavior in glycine-doped MgB2 bulks

Cai, Qi; Guo, Qianying; Ma, Zongqing; Li, Huijun

doi:10.1007/s10853-015-9580-1

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…However, the low J c of pristine MgB 2 is mainly caused by poor grain connectivity, porosity and weak flux pinning. Various attempts including chemical doping, additives, irradiation, ball milling and the optimization of fabrication processes have so far been used to try to improve the J c [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The agglomeration of nanoparticles was a problem during the dry mixing of raw powders. In order to solve this problem, carbohydrates (such as C 4 H 6 O 5 [14], C 3 H 4 O 4 [15], and C 2 H 5 NO 2 [5]), which can be dissolved in a solvent, were selected and proved to be effective carbon sources. Boron was substituted by carbon released by the decomposition of the carbohydrate during heat treatment, which resulted in an increase in H c2 and J c values.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

Suo

Liu

et al. 2020

Supercond. Sci. Technol.

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The influence of C 6 H 16 N 2 addition on the microstructural and superconducting properties of MgB 2 was systematically investigated. Unlike previously reported carbon sources, the C 6 H 16 N 2 additive had no effect on the lattice parameters of MgB 2 . However, the obvious improvement of critical current density (J c ) was obtained for C 6 H 16 N 2 added MgB 2 without carbon substitution for boron. The average grain size was reduced with the addition of C 6 H 16 N 2 . Additionally, different numbers of spherical MgB 2 grains appeared inside the C 6 H 16 N 2 added MgB 2 . As the added amount of C 6 H 16 N 2 increased, the active cross-sectional area fraction (A F ) values first increased then decreased. The possible reasons for these results have been discussed. The additive C 6 H 16 N 2 resulted in a small depression in T c and slightly increased the ∆T c of MgB 2 at 0 T. The H c2 (T) and H irr (T) values of C 6 H 16 N 2 added MgB 2 samples are larger than those of pure MgB 2 at temperatures below 25 K. It was concluded that the reduced grain size and the improved grain connectivity were mainly correlated with the enhancement of the J c , F p , H c2 , and H irr performances in C 6 H 16 N 2 added MgB 2 superconductors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

Suo

Liu

et al. 2020

Supercond. Sci. Technol.

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“…Some groups treated MgO the same as Mg 2 Si in SiC doping, which acts as a pinning centre and enhances the critical current density. They thought that in organic compounded doping, the MgO was coming from the reaction 2Mg+CO 2 =2 MgO+C [13,14].…”

Section: Introductionmentioning

confidence: 99%

A novel gas–solid reaction process to synthesize low oxygen MgB₂ powder using Mg vapour

Zhang

Tian

et al. 2018

Supercond. Sci. Technol.

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We have established a novel reaction process using Mg vapour and B powder (a gas–solid reaction) to synthesize MgB2 powder with a low oxygen content. For the first time, we tried to eliminate the oxygen in Mg powder with a specially designed furnace tube that can keep the sample under an inert atmosphere throughout the entire synthesis process. The duration of heat treatment has a conspicuous effect on the phase formation of MgB2 which differs greatly from the conventional solid state reaction method. At short durations such as 1 h, unreacted B powder is ubiquitous in the sample. Full formation of MgB2 is achieved at 3 h. At longer times such as 4 h, MgB2 decomposes to form MgB4. It is deduced that the main reason for the unstable MgB2 phase formation in the gas–solid reaction is the Mg vapour present during the entire process. A feasible chemical reaction model of the novel gas–solid reaction has been established. This work provides an important foundation to obtain almost oxygen-free MgB2, which can finally resolve the mystery of the effect of oxygen on superconductivity in this system.

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Evaluation of quenching-induced lattice strain and superconducting properties in un-doped and glycine-doped MgB2 bulks

Cai

Guo

et al. 2016

J Mater Sci: Mater Electron

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Thermodynamic and kinetic evidence for MgO formation and pinning behavior in glycine-doped MgB2 bulks

Cited by 4 publications

References 41 publications

Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

A novel gas–solid reaction process to synthesize low oxygen MgB₂ powder using Mg vapour

Evaluation of quenching-induced lattice strain and superconducting properties in un-doped and glycine-doped MgB2 bulks

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Thermodynamic and kinetic evidence for MgO formation and pinning behavior in glycine-doped MgB2 bulks

Cited by 4 publications

References 41 publications

Enhancement of J c in C6H16N2 added MgB2 superconductor without carbon substitution for boron

Enhancement of J c in C6H16N2 added MgB2 superconductor without carbon substitution for boron

A novel gas–solid reaction process to synthesize low oxygen MgB2 powder using Mg vapour

Evaluation of quenching-induced lattice strain and superconducting properties in un-doped and glycine-doped MgB2 bulks

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Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

Enhancement of J _c in C₆H₁₆N₂ added MgB₂ superconductor without carbon substitution for boron

A novel gas–solid reaction process to synthesize low oxygen MgB₂ powder using Mg vapour