Influence of different mixing ratios of Mg and B powder on structural and superconducting properties in MgB2

Matsuoka, Hiroaki; Watanabe, Yoshifumi; Maeda, Masafumi; Kawakami, Takateru; Kubota, Yoshihiro

doi:10.1016/j.physc.2009.05.191

Cited by 2 publications

(2 citation statements)

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“…The construction of in situ MgB 2 wires requires application of a diffusion barrier to prevent reaction of magnesium with stabilizing copper. For that purpose niobium is usually applied [1][2][3][4] thanks to its very low reactivity with magnesium and its high ductility. But the softness of niobium also has some disadvantages, for example during wire drawing it hardens and may develop micro-cracks.…”

Section: Introductionmentioning

confidence: 99%

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

Gajda

Zaleski

Morawski

et al. 2015

Supercond. Sci. Technol.

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In this paper we present the results of critical current (I c ) measurements of MgB 2 wires made with two different set-ups of the four-point probe method: current sweep type-constant magnetic field and increasing current, and field sweep type-constant current and rapidly increasing magnetic field. Results from magnet field sweep type measurements can be interpreted by a new physical concept-a jump of the electric field in low magnetic fields. This physical concept can be correlated with damages in the Nb-barrier existing in the MgB 2 wire and be employed as a detection scheme. The damage in Nb barrier reduces critical current density (J c ) and complicates the study on critical temperature (T c ), upper critical field (B c2 ), irreversible magnetic field (B irr ), pinning force (F p ), and pinning centers in superconducting MgB 2 wires. Our proposed method to detect damages in Nb barrier would benefit efforts in development and applications of MgB 2 wires.

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Section: Introductionmentioning

confidence: 99%

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

Gajda

Zaleski

Morawski

et al. 2015

Supercond. Sci. Technol.

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show abstract

“…Segundo Dou et al (2002), a presença de MgO no material preparado sem atmosfera controlada não costuma exceder 5% do total da fase supercondutora, e não prejudica significativamente as propriedades do supercondutor (SHCHERBAKOVA et al, 2007). Segundo Matsuoka et al (2009) Após a dilatometria, verificou-se que a fase MgB 2 ainda é a principal constituinte do material. Porém, como a exposição à alta temparatura deu-se em atmosfera ambiente, diversos outros compostos aparecem como componentes minoritários do material.…”

Section: Medidas De Magnetizaçãounclassified

Estudo das propriedades supercondutoras e da microestrutura do supercondutor Mg'B IND. 2' puro e dopado com compostos de carbono

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Influence of different mixing ratios of Mg and B powder on structural and superconducting properties in MgB2

Cited by 2 publications

References 12 publications

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

Estudo das propriedades supercondutoras e da microestrutura do supercondutor Mg'B IND. 2' puro e dopado com compostos de carbono

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Influence of different mixing ratios of Mg and B powder on structural and superconducting properties in MgB2

Cited by 2 publications

References 12 publications

The electric field jump—detection of damaged Nb barrier in MgB2wires annealed under pressure

The electric field jump—detection of damaged Nb barrier in MgB2wires annealed under pressure

Estudo das propriedades supercondutoras e da microestrutura do supercondutor Mg'B IND. 2' puro e dopado com compostos de carbono

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The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure

The electric field jump—detection of damaged Nb barrier in MgB₂wires annealed under pressure