Effects of silver additions on resistance to thermal shock and delayed failure of YBa2Cu3O7−δ superconductors

Singh, J. P.; Joo, Jinho; Singh, Dileep; Warzynski, T.; Poeppel, R.B.

doi:10.1557/jmr.1993.1226

Cited by 37 publications

(9 citation statements)

References 17 publications

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“…Silver is one of the few metals which can be added to 123 without degrading its superconducting properties. Many favourable properties on the addition of Ag have been reported in the literature [43][44][45][46][47]. Silver is thought to improve not only the mechanical properties like Young modulus and fracture toughness, but also is observed to reduce the gap width between the platelets [48] probably by its partial dissolution in the liquid thereby modifying the liquid phase properties below T p [49].…”

Section: Gdba 2 Cu 3 O 7 /Gd 2 Bacuo 5 +Ag Compositementioning

confidence: 99%

Fabrication of textured (RE = Y, Gd) composites by infiltration and growth of preforms by liquid phases

Reddy

Rajasekharan

1998

Supercond. Sci. Technol.

123

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A process for the fabrication of high-quality and near-net-shaped superconducting specimens of (Y-123) with uniformly distributed fine (Y-211) is discussed. The process involves the fabrication of 211 preforms by conventional ceramic routes such as uniaxial and isostatic pressing, injection moulding and slip casting, and pressureless infiltration basically from a reservoir containing liquid phases. A compact of 123 or 123 rich in liquid phases(s), acting as a source of liquid phases, is placed in contact with the 211 preform, and heated above the peritectic temperature of 123. The liquid from the source compact infiltrates the 211 filler and the peritectic reaction occurring between the preform material (211) and the matrix (liquid phases) during slow cooling from the peritectic temperature results in the growth of 123 with uniformly distributed fine 211 particles. We have also demonstrated that the present process can be extended to the fabrication of other rare earth (RE) superconductors where a solid solution of the kind occurs due to comparable size of the RE and Ba atoms, by choosing the RE = Gd system as an example. Herein the advantages and bounds of the process are reviewed; the effect of various cooling rates on the growth kinetics of 123 and the resulting macro- and microstructures are discussed. Fabrication of composites containing fine and very uniformly distributed Ag is also demonstrated by the process. Comparisons are made between the characteristics of the samples produced in the present process and the existing melt texturing process. The utility of the process is demonstrated by the fabrication of a three-dimensional component - a hollow cylinder.

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Section: Gdba 2 Cu 3 O 7 /Gd 2 Bacuo 5 +Ag Compositementioning

confidence: 99%

Fabrication of textured (RE = Y, Gd) composites by infiltration and growth of preforms by liquid phases

Reddy

Rajasekharan

1998

Supercond. Sci. Technol.

123

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“…During the deposition cycles, a controlled excess of Gd material is introduced to promote Gd-rich secondary phase precipitation during the oxidation cycles. Elemental Ag was co-evaporated alongside Gd, Ba, and Cu during HTS deposition, which is known to promote YBa 2 Cu 3 O 7−d oriented growth (Matsumoto et al, 1989;Chuang et al, 1995;Clausen et al, 1996), improve mechanical properties by filling voids (although no voids were found in this study) (Singh et al, 1993;Chuang et al, 1995), increase critical current densities (Matsumoto et al, 1989;Chuang et al, 1995;Misra et al, 1995;Clausen et al, 1996), and improve thermal cycling (Singh et al, 1993). The Sm sample was not, however, doped with Ag.…”

Section: Manufacture Ofmentioning

confidence: 90%

Laser-Assisted Field Evaporation of (R = Gd, Sm) High-Temperature Superconducting Coated Conductors

Smith

Huh

Shelton

et al. 2021

Microscopy and Microanalysis

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In the field of high-temperature superconductors, atom probe tomography is a relatively new instrument, with the ability to provide a new perspective on the 3D nanoscale microstructure. However, field evaporation of nonmetallic materials is fraught with unique challenges that matter little in the world of metallic evaporation. In this study, we review the laser absorption, correlated evaporation, molecular dissociation, and the crystallographic effects on the field evaporation of 800-m ${\rm RB}{\rm a}_ 2{\rm C}{\rm u}_ 3{\rm O}_{ 7-{\rm \delta }}$ (R = Gd, Sm) coated conductor tapes deposited by Reactive Co-Evaporation Cyclic Deposition and Reaction (RCE-CDR). Ultraviolet 355 nm laser pulsing was found to have a substantial beneficial effect on minimizing the fracture probability compared with 532 nm illumination, especially when evaporating insulating oxide precipitates. This, in turn, allows for the 3D compositional analysis of defects such as flux pinning centers introduced by precipitation and doping. As a result, evidence for the precipitation of nanoscale ${\rm G}{\rm d}_ 2{\rm C}{\rm u}_ 2{\rm O}_ 5$ is discussed. The effect of crystallographic orientation is studied, where [001] aligned evaporation is found to develop compositional aberrations.

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“…Recent studies have shown that the maximum trapped field is restricted by the poor mechanical properties of bulk superconductors, and therefore their improvement is critical for the achievement of high trapped fields. It is known that Ag addition is effective in improving the mechanical properties [8,9]. The peritectic decomposition temperature of LRE-Ba-Cu-O is depressed with Ag addition, however no appreciable change in T c is observed.…”

Section: Introductionmentioning

confidence: 98%

Superconducting properties of large grain (Sm, Gd)-Ba-Cu-O blocks

Inoue¹,

Sakai²,

Chauhan³

et al. 2000

Supercond. Sci. Technol.

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We fabricated large grain (Sm, Gd)-Ba-Cu-O bulk superconductors with the top-seeded, melt-growth process in air and 1%O 2 -Ar. Ag addition was effective in suppressing the amount of cracking. Unlike Sm-Ba-Cu-O, the (Sm, Gd)-Ba-Cu-O bulk showed relatively high T c and large J c values even when melt-processed in air. The trapped field value of 0.83 T was recorded at 77 K for the sample melt processed in air.

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Effects of silver additions on resistance to thermal shock and delayed failure of YBa₂Cu₃O_7−δ superconductors

Cited by 37 publications

References 17 publications

Fabrication of textured (RE = Y, Gd) composites by infiltration and growth of preforms by liquid phases

Fabrication of textured (RE = Y, Gd) composites by infiltration and growth of preforms by liquid phases

Laser-Assisted Field Evaporation of (R = Gd, Sm) High-Temperature Superconducting Coated Conductors

Superconducting properties of large grain (Sm, Gd)-Ba-Cu-O blocks

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