Flux pinning in Al doped TSMG YBCO bulk superconductors

Antal, V.; Kaňuchová, Mária; Šefčiková, M.; Kováč, J.; Diko, P.; Eisterer, M.; Hörhager, N; Zehetmayer, Martin; Weber, H.W.; Chaud, X.

doi:10.1088/0953-2048/22/10/105001

Cited by 25 publications

(19 citation statements)

References 35 publications

(50 reference statements)

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“…The superconductivity that is in agreement with Antal et al [3]. The value of superconducting transition temperatures T co , for the pure (x=0.00) polycrystalline Y-123 material, determined from the resistivity curve, again ignoring the foot structure, is significantly higher than those obtained from another method such as thermoelectric power curves.…”

Section: Resultssupporting

confidence: 88%

Influence of magnetic fields on the critical temperature of bulk YBCO superconductor with nanometer-sized Al2O3 inclusions

Shams¹,

Mahmoodinezhad²

2016

J. Fundam and Appl Sci.

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YBCO specimens along with different amounts of nano-sized Al 2 O 3 were prepared using solid state reaction method. The structural characterization of all samples has been carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The XRD patterns with Rietveld refinement procedure was used to characterize the samples crystal microstructure. SEM analysis revels the phases with distribution of Al 2 O 3 nanoparticles along the YBCO grain boundaries systematically. Superconducting parameters are affected by the nanoparticle addition, and results are discussed in bearing to the structural and microstructure differences between pure Y-123 and doped Y-123. The temperature dependence of electrical resistivity ρ (T) has been measured and the effect of addition of Al 2 O 3 nanoparticles with and without magnetic fields in the superconductivity and normal region has been reported.

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Section: Resultssupporting

confidence: 88%

Influence of magnetic fields on the critical temperature of bulk YBCO superconductor with nanometer-sized Al2O3 inclusions

Shams¹,

Mahmoodinezhad²

2016

J. Fundam and Appl Sci.

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“…At the same time, the oxygen gap between the surface oxygenated layer and the core tetragonal phase must be kept lower than the critical one for crack formation. Oxygenation at 750 • C and the pressure from 160 bars of small samples cut from the TSMG YBCO bulk confirmed the possibility of eliminating oxygenation cracks and the expected significant increasing of J c [9,10] (figure 4). As the critical oxygen gap is lower for a/b-crack formation than for a/c-crack formation and the a/bmicrocracking is influenced by the size of 211 particles, we may obtain six different cracking microstructures depending on the oxygenation parameters and the size of 211 particles with related reduced effective sample cross-section as expressed in figure 5.…”

Section: Map Of Cracking Caused By Post-growth Treatmentmentioning

confidence: 59%

The influence of post-growth thermal treatments on the critical current density of TSMG YBCO bulk superconductors

Diko

Antal

Zmorayová

et al. 2010

Supercond. Sci. Technol.

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Oxygenation and thermochemical post-growth treatments of top seeded melt-growth (TSMG) YBCO bulk superconductors can significantly influence critical current density. It is shown that, depending on oxygenation conditions and the size of 211 particles, different reductions of intrinsic critical current density values can be obtained due to the reduction in the sample cross-section caused by the presence of a/b-microcracks induced by 211 particles, and a/band a/c-cracks induced by oxygenation. The possibility of eliminating oxygenation cracks by high pressure oxygenation and consequently significantly increasing the macroscopic critical current density is demonstrated. An effective dopant concentration for chemical pinning is proposed and possible clustering of substitutions in the Y123 lattice by thermochemical treatments is shown.

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“…The recycling technique is based on the TSMG process in air, which is used widely for primary single grain processing. The TSMG technique has drawn inspiration from the infiltration growth process .…”

Section: Methodsmentioning

confidence: 99%

“…The undercooling, Δ T (= T – T p ), is limited during the grain growth process to ensure that growth occurs only from a seed crystal placed on the top surface of the sample. The peritectic reaction for the YBCO system, Y 2 BaCuO 5 + Ba 3 Cu 5 O 8 (liquid) → YBa 2 Cu 3 O 6+δ , for example, occurs at a temperature of about 1000°C. This produces a superconducting (RE)Ba 2 Cu 3 O 7 (RE‐123) phase matrix that contains a distribution of discrete, nonsuperconducting (RE) 2 BaCuO 5 (RE‐211) inclusions that contribute directly to flux pinning .…”

Section: Introductionmentioning

confidence: 99%

“…The peritectic reaction for the YBCO system, Y 2 BaCuO 5 + Ba 3 Cu 5 O 8 (liquid) ? YBa 2 Cu 3 O 6+d , 7 for example, occurs at a temperature of about 1000°C. This produces a superconducting (RE)Ba 2 Cu 3 O 7 (RE-123) phase matrix that contains a distribution of discrete, nonsuperconducting (RE) 2 BaCuO 5 (RE-211) inclusions that contribute directly to flux pinning.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Composition of Primary and Recycled Single Grains of YBCO, GdBCO‐Ag, and SmBCO‐Ag Bulk Superconductors

et al. 2016

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The widespread use of single grain RE-Ba-Cu-O [(RE)BCO] bulk superconductors, where RE is typically Sm, Gd, or Y, is, in part, limited by the relatively high costs of precursor powders and the low success rate of the manufacturing process. Both these problems can be addressed by recycling primaryprocessed grains in which the initial growth process has failed in some way. Key to the use of recycled grains in practical applications is an assurance that their properties and performance are not inferior to those of primary grown grains. In this work, we describe the differences between the growth process, microstructure, and properties of primary and recycled (RE)BCO single grains. We observe that the mechanism of growth is the same for both primary and recycled single grain samples in all three RE-based systems investigated. In the recycling process additional liquid-rich phase powder is provided beneath a failed sample, whereby this liquid phase infiltrates upwards and contributes a sufficient concentration of additional RE species at the growth front to enable samples to grow relatively easily in the form of single grains by producing a more uniform composition at the growth front, which leads directly to an increased tolerance to the presence of Ag and Ce-rich agglomerates. Importantly, we observe that the recycled samples have a much more uniform composition, and therefore exhibit more uniform superconducting properties, than single grain samples fabricated by a primary grown process.

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Flux pinning in Al doped TSMG YBCO bulk superconductors

Cited by 25 publications

References 35 publications

Influence of magnetic fields on the critical temperature of bulk YBCO superconductor with nanometer-sized Al<sub>2</sub>O<sub>3</sub> inclusions

Influence of magnetic fields on the critical temperature of bulk YBCO superconductor with nanometer-sized Al<sub>2</sub>O<sub>3</sub> inclusions

The influence of post-growth thermal treatments on the critical current density of TSMG YBCO bulk superconductors

Microstructure and Composition of Primary and Recycled Single Grains of YBCO, GdBCO‐Ag, and SmBCO‐Ag Bulk Superconductors

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