Effect of extremely fine Y2BaCuO5 precipitates on the critical current density of melt-processed YBa2Cu3Ox

Sengupta, S.; Shi, Donglu; Luo, Jian; Buzdin, Alexandre I.; Gorin, V.; Todt, V.R.; Varanasi, C.; McGinn, Paul J.

doi:10.1063/1.365280

Cited by 15 publications

(9 citation statements)

References 97 publications

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“…211 additive. We reported above the efficiency of the addition in large amounts of Y211 particles (up to 40% by weight) to stoichiometric Y123 to decrease the particle size of the Y211 phase coming from the decomposition of the Y123 precursor [50][51][52].…”

Section: Use Of Additivesmentioning

confidence: 99%

Texturing of high-T_csuperconductors

Desgardin

Monot

Raveau

1999

Supercond. Sci. Technol.

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Most of the potential applications of the high-temperature superconductors require large critical currents, much higher than those obtained using a classical sintering process. This paper reviews different processes and corresponding recent results in the field of texturing high-Tc superconductors in order to align and develop the planes where the current flows easily. Different melt-textured growth methods are discussed from both theoretical and practical viewpoints, and the limitations associated with the diffusion and interface phenomena are introduced. Influence of the process parameters, as well as the microstructure of the precursors and the use of additives in order to enlarge the single domain size and to optimise the superconducting characteristics is discussed. Mechanical texturing and texturing under a magnetic field, as well as combination of both processes, are also considered. Recent results, which appear to be an important breakthrough for the industrial development because of the large crystallization rates are also mentioned.

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Section: Use Of Additivesmentioning

confidence: 99%

Texturing of high-T_csuperconductors

Desgardin

Monot

Raveau

1999

Supercond. Sci. Technol.

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“…While some studies with bulk materials showed improvement of flux pinning with 211 addition, 15,[17][18][19][20] other studies reported otherwise possibly because of large 211 particle size. 3, 15-20 and references therein); however, there has been no attempt thus far to incorporate 211 particles directly into the microstructure of 123 thin films.…”

Section: Introductionmentioning

confidence: 99%

“…3, 15-20 and references therein); however, there has been no attempt thus far to incorporate 211 particles directly into the microstructure of 123 thin films. [17][18][19][20]. 16 In fully processed bulk materials, the 211 particle size is usually submicrometer to micrometer and the area particle density is typically very low, <10 10 cm −2 , although a very few 10-100-nm size particles can exist with area particle density <10 10 cm −2 (Refs.…”

Section: Introductionmentioning

confidence: 99%

“…While some studies with bulk materials showed improvement of flux pinning with 211 addition, 15,[17][18][19][20] other studies reported otherwise possibly because of large 211 particle size. 3,[18][19][20] In the work herein, the size of 211 incorporated into 123 is on the order 10-15 nm, and the surface number density is sufficiently high to cause an increase of flux pinning without the possible effect of dislocations. [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Island growth of Y₂BaCuO₅ nanoparticles in (211_{∼1.5 nm}/123_{∼10 nm})×N composite multilayer structures to enhance flux pinning of YBa₂Cu₃O_7−δ films

et al. 2003

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A controlled introduction of second-phase Y 2 BaCuO 5 (211) nanoparticles into YBa 2 Cu 3 O 7−␦ (123) thin films was achieved for the first time for the purpose of increasing flux pinning. The island-growth mode of 211 on 123 was utilized to obtain an area particle density >10 11 cm −2 of 211 thick-disk-shaped nanoparticles in individual layers. Composite layered structures of (211 y nanoparticles/123 z )×N were deposited by pulsed laser deposition on LaAlO 3 substrates, with N bilayers ‫ס‬ 24 to 100, y thickness ‫ס‬ 1 to 2 nm, and z thickness ‫ס‬ 6 to 15 nm (assuming continuous layer coverage). With 211 addition, the critical current densities at 77 K were higher at magnetic fields as low as 0.1 T and increased as much as approximately 300% at 1.5 T. The superconducting transition temperature was reduced by approximately 2 to 4 K for 211 volume fraction <20%. Reinitiation of 123 growth after every 211 layer resulted in a smooth and flat surface finish on the films and also greatly reduced surface particulate formation especially in thicker films (∼1 m).

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“…To enhance the transport properties of HTSCs, several methods [4,7], such as inclusion of impurities [8,9], partial substitution and preparation at high pressures [10], were developed. In addition to these procedures, it is generally accepted that the most suitable procedure to increase the critical current in HTSCs is the creation of an optimum density of defects with adequate distribution within the material.…”

Section: Introductionmentioning

confidence: 99%

Methodological, applied and thermodynamic aspects of hydrogen sorption by graphite and related carbon nanostructures

Nechaev¹,

Alekseeva²

2004

Russ. Chem. Rev.

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We have investigated the damage induced by irradiation in Y 1 Ba 2 Cu 3 O 7−x silver added samples. The samples were prepared with 0 and 6.5 wt% of silver and irradiated by high-energy γ irradiation (50-150 Mrad). The roles of silver and dosage irradiation are discussed in terms of their effects on microstructure, crystallinity, critical temperature (T c ) and zero-resistance temperature (T 0 ). After irradiation, T c decreased while the room-temperature electrical resistance increased by a factor of 8 for some of the samples. The difference in T 0 between irradiated and non-irradiated YBCO samples was of the order of 10 K. We have found that the difference is bigger for silver-added samples. We have also observed several changes in diffraction patterns of YBCO and YBCO-silver samples. SEM images, EDS and XPS analysis showed that silver resided inside the grains as single atoms and as metallic clusters. The relative concentrations of the elements in samples were quantified by Auger electron spectroscopy. The J c values showed a gradual increase for radiation doses ranging between 0 and 100 Mrad. For doses up to 100 Mrad, J c decreased because of the weak-link breakage induced by high doses of γ rays.

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Effect of extremely fine Y2BaCuO5 precipitates on the critical current density of melt-processed YBa2Cu3Ox

Cited by 15 publications

References 97 publications

Texturing of high-T_csuperconductors

Texturing of high-T_csuperconductors

Island growth of Y₂BaCuO₅ nanoparticles in (211_{∼1.5 nm}/123_{∼10 nm})×N composite multilayer structures to enhance flux pinning of YBa₂Cu₃O_7−δ films

Methodological, applied and thermodynamic aspects of hydrogen sorption by graphite and related carbon nanostructures

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Effect of extremely fine Y2BaCuO5 precipitates on the critical current density of melt-processed YBa2Cu3Ox

Cited by 15 publications

References 97 publications

Texturing of high-Tcsuperconductors

Texturing of high-Tcsuperconductors

Island growth of Y2BaCuO5 nanoparticles in (211∼1.5 nm/123∼10 nm)×N composite multilayer structures to enhance flux pinning of YBa2Cu3O7−δ films

Methodological, applied and thermodynamic aspects of hydrogen sorption by graphite and related carbon nanostructures

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Texturing of high-T_csuperconductors

Texturing of high-T_csuperconductors

Island growth of Y₂BaCuO₅ nanoparticles in (211_{∼1.5 nm}/123_{∼10 nm})×N composite multilayer structures to enhance flux pinning of YBa₂Cu₃O_7−δ films