Low temperature phase transformation in Nb&amp;lt;inf&amp;gt;3&amp;lt;/inf&amp;gt;Sn multifilamentary wires and the strain dependence of their critical current density

Flükiger, R.; Schauer, W.; Specking, W.; Schmidt, B.; Springer, E.

doi:10.1109/tmag.1981.1061288

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…In spite of different strand parameters, the samples exhibit the same strain dependency of normalized , except for GNSM-J (without Ti addition). The rapid degradation of for GNSM-J, that was observed in early works [5], [6], may come from a lower of 21.9 T. The strain dependency of normalized for Ti addition samples is quite similar to that for the TF Nb Sn strand (Ti addition) that exhibits the lowest strain sensitivity [7].…”

Section: A Critical Current Densitysupporting

confidence: 51%

Influence of Wire Parameters on Critical Current Versus Strain Characteristics of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Superconducting Wires

Miyatake

Murakami

Kurahashi

et al. 2012

IEEE Trans. Appl. Supercond.

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In order to develop bronze processed Nb Sn wire for the ITER CS coil operating under higher compressive strain, the influence of various parameters of Nb Sn wires such as filament diameter, barrier materials, barrier thickness, heat treatment pattern and Ti addition on critical current versus intrinsic strain ( 1.0% 0.1%) characteristics was investigated. The change of these parameters brought significant changes to superconducting properties such as and -value. In spite of different wire parameters, the strain dependency of normalized was almost the same, except that a Ti addition affects the upper critical field . This result suggests that assuming the same Ti-addition level, Nb Sn wire with higher performance at a certain would exhibit higher performance at any in the compressive regime. Based on the result, bronze processed Nb Sn wires with non-Cu critical current density more than 1100 A/mm at 12 T, 4.2 K, zero applied strain have been successfully developed for the CS coil.

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Section: A Critical Current Densitysupporting

confidence: 51%

Influence of Wire Parameters on Critical Current Versus Strain Characteristics of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Superconducting Wires

Miyatake

Murakami

Kurahashi

et al. 2012

IEEE Trans. Appl. Supercond.

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“…For wires, 0 H c2 ͑T͒ data are available in limited fields [15][16][17][18][19][20] while few publications report single high-field points at liquid-helium temperature. 17,18,[21][22][23] Extrapolation of data measured up to 22 T indicates a zero-temperature upper critical field ͓ 0 H c2 ͑0͔͒ in thin films ranging from 26 to 29 T, depending on resistivity.…”

Section: Introductionmentioning

confidence: 99%

“…18,33 These ternary additions may also prevent the formation of tetragonal phases which reduce 0 H c2 ͑0͒. 20,34 A third characteristic of wires is the presence of residual strain. Macroscopically, the strain dependence on 0 H K ͑T͒ is well understood in terms of axial strain, [35][36][37] or deviatoric strain, 38,39 but its influence on the complete H-T phase transition is still uncertain.…”

Section: Introductionmentioning

confidence: 99%

The upper critical field of filamentary Nb3Sn conductors

Godeke

Jewell

Fischer

et al. 2005

Journal of Applied Physics

107

128

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We have examined the upper critical field of a large and representative set of present multifilamentary Nb 3 Sn wires and one bulk sample over a temperature range from 1.4 K up to the zero-field critical temperature. Since all present wires use a solid-state diffusion reaction to form the A15 layers, inhomogeneities with respect to Sn content are inevitable, in contrast to some previously studied homogeneous samples. Our study emphasizes the effects that these inevitable inhomogeneities have on the field-temperature phase boundary. The property inhomogeneities are extracted from field-dependent resistive transitions which we find broaden with increasing inhomogeneity. The upper 90%-99% of the transitions clearly separates alloyed and binary wires but a pure, Cu-free binary bulk sample also exhibits a zero-temperature critical field that is comparable to the ternary wires. The highest 0 H c2 detected in the ternary wires are remarkably constant: The highest zero-temperature upper critical fields and zero-field critical temperatures fall within 29.5± 0.3 and 17.8± 0.3 K, respectively, independent of the wire layout. The complete field-temperature phase boundary can be described very well with the relatively simple Maki-DeGennes model using a two-parameter fit, independent of composition, strain state, sample layout, or applied critical state criterion.

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“…Reversible changes in the properties are caused by strain-induced distortion of the atomic lattice [59]. Nb Sn for example, has a brittle A15 crystal structure with a cubic unit cell as schematically depicted in Figure 1-3, (b).…”

Section: A Lattice Strain and Microscopic Originmentioning

confidence: 99%

“…the filamentary critical current density J c varies through a change in μ 0 c2 (T) that has a direct influence on the maximum bulk pinning force [60]. Strain can cause a lattice instability leading to a tetragonal distortion [59], [61], influencing the electron-electron interactions and thereby the electron density of states (DOS) at the Fermi level N(E F ) and, through the condensation energy, the interaction between flux-lines and pinning centers. Experiments show that reversible changes are related closely to the deviatoric strain, while the impact of volumetric strain is negligible [62].…”

Section: A Lattice Strain and Microscopic Originmentioning

confidence: 99%

Intra wire resistance and strain affecting the transport properties of Nb3Sn strands in cable-in-conduit conductors

Zhou

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Low temperature phase transformation in Nb<inf>3</inf>Sn multifilamentary wires and the strain dependence of their critical current density

Cited by 15 publications

References 13 publications

Influence of Wire Parameters on Critical Current Versus Strain Characteristics of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Superconducting Wires

Influence of Wire Parameters on Critical Current Versus Strain Characteristics of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Superconducting Wires

The upper critical field of filamentary Nb3Sn conductors

Intra wire resistance and strain affecting the transport properties of Nb3Sn strands in cable-in-conduit conductors

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