Concurrent doping effect of Ti and nano-diamond on flux pinning of MgB2

Zhao, Yong; Ke, Chuan; Cheng, C.H.; Feng, Yang; Yang, Ye; Munroe, Paul

doi:10.1016/j.physc.2010.05.045

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…The weighting parameters which show the contribution of each mechanism can be determined by fitting a curve to the above equation. This method has been applied by several groups [18,[25][26][27]. Figure 11 shows the pinning force density (F p /F max ) of the T3 (air-cooled) sample as a function of the reduced magnetic field (B/B C2 ).…”

Section: Pinning Mechanismsmentioning

confidence: 99%

Microstructure and superconducting properties of Sn–In and Sn–In–Bi alloys as Pb-free superconducting solders

Mousavi

Aksoy

Grovenor

et al. 2015

Supercond. Sci. Technol.

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In this work the microstructure and superconducting properties of various compositions of binary Sn-In and ternary Sn-In-Bi alloys have been studied as potential replacements for the Pb-based superconducting solders currently used for superconducting joints between technological low temperature superconducting wires. The influence of chemistry and microstructure on the superconducting properties are investigated. Both the Sn-In β and γ phases are stable over a fairly wide range of chemical composition, with the superconducting properties of each phase improving with increasing solute concentration, but the results show that the In-rich β phase has better superconducting properties than the Sn-rich γ phase. For this reason, in both the binary Sn-In and the ternary Sn-In-Bi systems, the best superconducting properties are achieved in alloys with a high volume fraction of β-phase. The ternary alloys generally show better superconducting properties than the binary alloys, with the highest values of 6.9 K, 0.18 T and 1.3×10 8 A/m 2 measured for TC, BC2 (at 4.2 K) and JC (at 4.2 K, 0.01 T) respectively in the Sn35In50Bi15 alloy that consists of a matrix of β-phase with fine fibres of γ and BiIn2. The dependence of the pinning force on the reduced magnetic field exhibits a scaling law behaviour with the maximum at B/BC2~0.2 indicating that the dominant mechanism is surface normal pinning in these solders. Rapid solidification in liquid nitrogen results in manipulation of the phase chemistry by both increasing the solute content in the majority phase, changing the fraction of each phase and reducing the scale of the microstructure, leading to significant improvements in superconducting performance. However, the quenched alloys age 2 considerably, even at room temperature, resulting in a deterioration in BC2 and JC values over a few days.

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Section: Pinning Mechanismsmentioning

confidence: 99%

Microstructure and superconducting properties of Sn–In and Sn–In–Bi alloys as Pb-free superconducting solders

Mousavi

Aksoy

Grovenor

et al. 2015

Supercond. Sci. Technol.

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show abstract

“…It is quite possible that several elementary pinning mechanisms cooperate in the system simultaneously. Several modified models including the superposition of several pinning mechanisms [23], the shift of H irr [24], and the combination of both [25] were proposed to fit and interpreter the experimental data of the scaling behavior for high-T c Bi2223 superconductors and also MgB 2 superconductors. However, these models are hardly to fit the data for the 123-type high-T c superconducting melt-textured bulks because the pinning sources are much more complicated in this system.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Cheng

Hsieh

et al. 2011

J. Mod. Transport.

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High quality GdBa 2 Cu 3 O 7-y (Gd123) textured bulks with Nd 2 BaCuO 5 (Nd211) nanoparticle precipitations have been fabricated by a nanoparticle-powders-assisted MTG (melt-textured-growth) technique. The high density nanoscale flux pinning sites were introduced into Gd123 by mixing Nd211 nanoparticle powders (about 20-50 nm) with Gd123 nano-precursors before the MTG process. Microstructural analyses reveal that a large number of Nd211 nanoparticles with a size around 50-150 nm were inserted in the Gd123 matrix, forming a kind of superconducting nanocomposites. The critical current density at 77 K is systematically increased and the flux pinning behavior is significantly improved. The scaling behavior of the flux pinning force shows a magnetic field dependent feature with a peak located at h p 0.4. This may be the fingerprint of melt-textured 123 compounds, which cannot be interpreted by the simple superposition of different types of elementary pinning sources.

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Co-current Doping Effect of Nanoscale Carbon and Aluminum Nitride on Critical Current Density and Flux Pinning Properties of Bulk $$\hbox {MgB}_{2}$$MgB2 Superconductors

Tripathi

Dey

2018

J Low Temp Phys

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Concurrent doping effect of Ti and nano-diamond on flux pinning of MgB2

Cited by 6 publications

References 18 publications

Microstructure and superconducting properties of Sn–In and Sn–In–Bi alloys as Pb-free superconducting solders

Microstructure and superconducting properties of Sn–In and Sn–In–Bi alloys as Pb-free superconducting solders

Enhancement of flux pinning in GdBa2Cu3O7−y bulks prepared by nanoparticle-powder-assisted method

Co-current Doping Effect of Nanoscale Carbon and Aluminum Nitride on Critical Current Density and Flux Pinning Properties of Bulk $$\hbox {MgB}_{2}$$MgB2 Superconductors

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