Magnetic Field Trapping in MgB$_{2}$ Bulks and Inserts

Perini, E.; Giunchi, G.; Saglietti, L.; Albisetti, Alessandro Figini; Matrone, A.; Cavaliere, V.

doi:10.1109/tasc.2010.2086043

Cited by 30 publications

(24 citation statements)

References 6 publications

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“…However, both Viznichenko et al [6] and Mikhenko et al [14] have suggested that J c values of 7-9x10 9 A/m 2 and trapped fields of 4 T at 20 K and 7 T at 4.2 K are possible theoretically. Following on from earlier work by Giunchi et al [3,15], Perini [16] has reported more recently a trapped field of 1 T in a bulk MgB 2 sample fabricated by an Mg infiltration growth technique. Hsieh et al [17] further reported local J c values in zero field of up to 8x10 8 A/m 2 in samples fabricated by uniaxial hot pressing.…”

Section: Introductionmentioning

confidence: 87%

A trapped field of >3 T in bulk MgB₂fabricated by uniaxial hot pressing

Durrell¹,

Dancer²,

Dennis³

et al. 2012

Supercond. Sci. Technol.

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A trapped field of over 3 T has been measured at 17.5 K in a magnetised stack of two discshaped bulk MgB 2 superconductors of diameter 25 mm and thickness 5.4 mm. The bulk MgB 2 samples were fabricated by uniaxial hot pressing, which is a readily scalable, industrial technique, to 91% of their maximum theoretical density. The macroscopic critical current density derived from the trapped field data using the Biot-Savart law is consistent with the measured local critical current density. From this we conclude that critical current density, and therefore trapped field performance, is limited by the flux pinning available in MgB 2 , rather than by lack of connectivity. This suggests strongly that both increasing sample size and enhancing pinning through doping will allow further increases in trapped field performance of bulk MgB 2 .

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Section: Introductionmentioning

confidence: 87%

A trapped field of >3 T in bulk MgB₂fabricated by uniaxial hot pressing

Durrell¹,

Dancer²,

Dennis³

et al. 2012

Supercond. Sci. Technol.

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“…Compared with REBa 2 Cu 3 O y (RE: Nd, Sm, Eu, Gd, NdEuGd) (REBCO) superconductors, the MgB 2 bulks do not require a long‐lasting oxygenation. With all these advantages, the MgB 2 disks can be used in a similar way as the melt‐textured YBa 2 Cu 3 O y /RE‐123 bulks, in energy production, energy storage, water purification, health care, and so on . Investigation of MgB 2 thin films showed critical current density by two orders of magnitude higher than that in polycrystalline MgB 2 bulks.…”

Section: Introductionmentioning

confidence: 99%

Flux Pinning and Superconducting Properties of Bulk MgB₂ with MgB₄ Addition

et al. 2019

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The improved performance of bulk MgB2 material with added nanometer‐sized MgB4 particles is presented. Bulk polycrystalline MgB2 samples with varying amount of MgB4 x (x = 0, 1, 2, 3, 4, 5, and 10 wt%) are fabricated by solid‐state sintering at 775 °C for 3 h in pure argon gas. Microstructural studies indicate formation of nanometer‐sized grains when MgB4 is added. Density of nano‐grains is inversely proportional to the MgB4 content. The MgB2 sample with 1 wt% of MgB4 shows the best performance, with its self‐field critical current density reaching 385 and 315 kAcm−2 at 15 and 20 K, respectively. Flux pinning diagrams reveal the domination of grain boundary pinning mechanism.

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“…The production of large bulk MgB 2 materials is rather easy to achieve and to the recent day, the achievable size was improved to several centimeters [14e18]. Elena et al produced large bulk plates with a diameter of 70 mm by the reactive Mgliquid infiltration process and studied the magnetic field trapping behavior from 5.6 K to 20 K [14]. The typical trapped field measured 1 mm above the surface of the device was found to be 1.12 T at 12 K.…”

Section: Introductionmentioning

confidence: 99%