Effect of fabrication process on the superconducting properties of MgB2 tapes

Zhang, X.P.; Ma, Yanwei; Wang, D.L.; Gao, Zhenyu; Wang, L.; Watanabe, Kazuo

doi:10.1016/j.physc.2008.05.090

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…Graphene-doped MgB 2 tapes were fabricated by the previously reported PIT method [15], starting from commercial powders of magnesium (10 μm, 99.5 %, Tangshan), crystalline boron powder (2-5 μm, 99.9999 %, Baoding), and single-layer graphene (0.7-1.2 nm, 99 %, Tianjin Plannano Technology Company (http://www.plannano.com/)). Mg and B powders were weighed with the nominal composition of 1.05:2, while the graphene doping level were 0, 6, 8, and 10 at% of the Mg and B powders, respectively.…”

Section: Methodsmentioning

confidence: 99%

Improved Transport J c in MgB2 Tapes by Graphene Doping

Tang

Wang

Zhang

et al. 2014

J Supercond Nov Magn

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Graphene is a special form of carbon which can effectively enhance the critical current density J c of MgB 2 . In this work, a systematic investigation on the impact of sintering conditions and doping level was carried out for graphene-doped MgB 2 tapes. It is found that an appropriate addition level, i.e., 8 at% in this work, is very critical to obtain a high J c in graphene-doped samples. The critical field and pinning force are improved obviously due to the graphene doping. The magnetic J c of samples sintered at 800 • C with 8 at% graphene doping reached 1.78 × 10 4 A/cm 2 , at 5 T, 20 K. At the same time, the transport J c was up to 2.38 ×10 4 A/cm 2 at 10 T, 4.2 K. The lattice distortion caused by C substitution and residual C at the grain boundaries were thought to be the major factors affecting the J c of graphene-doped MgB 2 samples.

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Section: Methodsmentioning

confidence: 99%

Improved Transport J c in MgB2 Tapes by Graphene Doping

Tang

Wang

Zhang

et al. 2014

J Supercond Nov Magn

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“…The rapid development of MgB 2 superconducting wires [1][2][3][4] reflects exceptional potential for industrial applications [5,6] as well as physical properties [7] that suit typical wire drawing processes [3,8]. Recent attention is focussed on optimising wire properties to achieve critical current density, J c , at higher magnetic fields than conventional low temperature superconductors to maximise industrial applications [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Low temperature decomposition of metal borohydride drives autogenous synthesis of MgB₂

Shahbazi¹,

Alarco²,

Talbot³

2017

Supercond. Sci. Technol.

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We describe a low temperature, autogenous pressure method to synthesise mm-scale MgB2 aggregates with highly connected grains. The decomposition of metal borohydrides such as NaBH4 and KBH4 at low temperature (i.e. < 150 °C) in the presence of Mg provides reactive boron species at pressure and subsequent formation of MgB2 in high yield. Optimum synthesis conditions include heating to 250 °C for > 30 min then a ramp to 450 °C < Tmax < 500 °C and 1.4 MPa < Pmax < 2.2 MPa. Reactions with KBH4 release reactive boron species at higher temperature (∼130 °C) than reactions with NaBH4 (∼80 °C–100 °C). Alkali metal solubility in MgB2 is at ∼ppm levels. The onset superconducting transition temperature, Tc, for MgB2 produced by these syntheses ranges between 38.3 and 38.5 K. Magnetic measurements of MgB2 aggregates show a grain connectivity comparable to powders produced at higher temperature (> 800 °C) and suggests that this synthesis approach may be effective for ex situ wire production.

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Effect of fabrication process on the superconducting properties of MgB2 tapes

Cited by 2 publications

References 17 publications

Improved Transport J c in MgB2 Tapes by Graphene Doping

Improved Transport J c in MgB2 Tapes by Graphene Doping

Low temperature decomposition of metal borohydride drives autogenous synthesis of MgB₂

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Effect of fabrication process on the superconducting properties of MgB2 tapes

Cited by 2 publications

References 17 publications

Improved Transport J c in MgB2 Tapes by Graphene Doping

Improved Transport J c in MgB2 Tapes by Graphene Doping

Low temperature decomposition of metal borohydride drives autogenous synthesis of MgB2

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Low temperature decomposition of metal borohydride drives autogenous synthesis of MgB₂