Effect of C and SiC additions into in situ or mechanically alloyed MgB2 deformed in Ti sheath

Kulich, M; Kòváč, Pavol; Eisterer, M.; Hušek, I; Melíšek, T; Weber, H.W.; Häßler, Wolfgang

doi:10.1016/j.physc.2009.05.007

Cited by 17 publications

(15 citation statements)

References 21 publications

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“…that chooses good quality grains (least resistance) [39]. This is in contrast to the inductive measurement where current loop passes through surface of material which includes good and poor quality grains.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of dense bulk MgB₂by an infiltration and growth process

Bhagurkar

Yamamoto

Babu

et al. 2014

Supercond. Sci. Technol.

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Abstract:We report the processing of dense, superconducting MgB 2 (ρ ≈ 2.4 g/cm 3 )by an infiltration and growth technique. The process, which involves infiltration of liquid magnesium at 750 ºC into a pre-defined boron precursor pellet, is relatively simple, results in the formation of a hard, dense structure and has the potential to fabricate large bulk samples of complex geometries. X-ray diffraction has been used to confirm the presence of the MgB 2 primary phase with only residual magnesium content in the fully processed samples. The samples exhibit sharp superconducting transitions at 38.4 K and have critical current densities of up to 260 kA/cm 2 in selffield at 5 K. Modest measured values of Hc 2 (0) of 17 T suggest that superconductivity in bulk MgB 2 fabricated by this technique is in the clean pairing limit.

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Section: Resultsmentioning

confidence: 99%

Synthesis of dense bulk MgB₂by an infiltration and growth process

Bhagurkar

Yamamoto

Babu

et al. 2014

Supercond. Sci. Technol.

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“…Generally, the resistive measurements give information from the selected volume of the sample, while the magnetic ones reflect an averaged volume quality. Consequently, lower T c from M(T) in comparison with R(T) is due to a different mechanism [18]. In the case of magnetization measurement, the quality of the whole superconducting MgB 2 core is measured, but, R(T) measurement provides information only from the localized part of MgB 2 (selective current paths through the sample).…”

Section: Critical Temperaturesmentioning

confidence: 99%

Properties of MgB₂wires made by internal magnesium diffusion into different boron powders

Kòváč¹,

Hušek²,

Rosová³

et al. 2015

Supercond. Sci. Technol.

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Different boron powders were used for MgB 2 wires manufactured by internal magnesium diffusion. The structure of the MgB 2 core, critical temperature and critical currents of Cu/Ti sheathed wires differing only in boron powder were analyzed and compared. It was found that the particle size and purity of boron powders influence the creation of the MgB 2 phase and, consequently, also considerably influence its superconducting properties. The highest critical current density in the low external field was measured for wire with a boron purity of 98.5% produced by Pavezyum. It was used also for stabilized multi-core MgB 2 wire with high engineering current densities in low magnetic fields at 20 K, which may be attractive for some low field applications, e.g. high-power wind generators.

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“…Several methods have been studied to decrease the strong dependence of the . These include, for instance, chemical doping, especially by usage of nanoparticles, the addition of normal particles that act as pinning centers [6]- [9]; optimization of heat treatment temperature [10]; irradiation [11], [12]; and ball-or mechanical milling [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Comparison on Effects of ${\rm B}_{4}{\rm C}$, ${\rm Al}_{2}{\rm O}_{3}$, and SiC Doping on Performance of ${\rm MgB}_{2}$ Conductors

Viljamaa

Kulich

Kòváč

et al. 2011

IEEE Trans. Appl. Supercond.

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Several MgB 2 monofilamentary samples are prepared to evaluate the effects that the doping compounds B 4 C, Al 2 O 3 , and SiC have on critical current density ( c ) and the c dependency of magnetic flux density ( ) of the sample. All of the samples in this study have Nb sheaths and are manufactured using in situ precursor powders and the Powder-in-Tube fabrication method. The amounts of added impurities are 10 wt.% for B 4 C and Al 2 O 3 , and 3, 10, and 20 wt.% for SiC. A reference sample without any doping is also prepared. All of the samples are heat treated between 650 and 800 C for 30 minutes. The transport c ( ) characteristics are measured at 4.2 K and the magnetic c ( ) behavior is obtained in varied temperatures up to 30 K.The changes in connectivity, or effective cross-section, are also evaluated by performing resistivity measurements on the samples after removal of the sheath. Furthermore, the pinning forces of the samples are evaluated from the magnetic measurements.Index Terms-Connectivity, current density, heat treatment, impurity addition, magnetic field effects, MgB 2 .

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Effect of C and SiC additions into in situ or mechanically alloyed MgB2 deformed in Ti sheath

Cited by 17 publications

References 21 publications

Synthesis of dense bulk MgB₂by an infiltration and growth process

Synthesis of dense bulk MgB₂by an infiltration and growth process

Properties of MgB₂wires made by internal magnesium diffusion into different boron powders

Comparison on Effects of ${\rm B}_{4}{\rm C}$, ${\rm Al}_{2}{\rm O}_{3}$, and SiC Doping on Performance of ${\rm MgB}_{2}$ Conductors

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Effect of C and SiC additions into in situ or mechanically alloyed MgB2 deformed in Ti sheath

Cited by 17 publications

References 21 publications

Synthesis of dense bulk MgB2by an infiltration and growth process

Synthesis of dense bulk MgB2by an infiltration and growth process

Properties of MgB2wires made by internal magnesium diffusion into different boron powders

Comparison on Effects of ${\rm B}_{4}{\rm C}$, ${\rm Al}_{2}{\rm O}_{3}$, and SiC Doping on Performance of ${\rm MgB}_{2}$ Conductors

Contact Info

Product

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Synthesis of dense bulk MgB₂by an infiltration and growth process

Synthesis of dense bulk MgB₂by an infiltration and growth process

Properties of MgB₂wires made by internal magnesium diffusion into different boron powders