Development of All-CSD Processes for Coated Conductors at Nexans: Limitations and Possible Solutions

Rikel, M.O.; Ehrenberg, J.; Mahachi, S; Klein, Michael W.; Schutz, J. B.; Böck, J.

doi:10.1109/tasc.2010.2079911

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…Moreover, this process gives crystallized films up to their ultimate surface as probed by EBSD. Similar results were observed at Nexans Hürth[24].Figure 32shows the overall microstructure observed by SEM with well visible grains transferred from Ni substrate. Some grain boundaries are more marked than others.…”

supporting

confidence: 80%

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

et al. 2013

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International audienceLa2Zr2O7 (LZO) films were deposited by chemical solution deposition on Ni95Wi5 Rolling Assisted Bi-axially Textured substrates to be used in YBa2Cu3O7 (YBCO) coated conductors. These LZO films were proved of good qualities for YBCO deposition by Metal Organic Chemical Vapour Deposition that is an economic process. The mosaic of LZO films is only slightly degraded by the process of grain-to-grain epitaxial transfer (16% with respect to that of the substrate). The film is composed of small crystallites (20 - 40 nm) and larger anomalous crystallites (100 - 400 nm) found in great number in transferred twins from the substrate. The anomalous crystallites are poorly crystallised or amorphous and contain more C than areas with normal crystallites. High temperature in-situ X ray shows a sudden crystallisation at 860°C that does not seems to involve a solid state reaction. The anomalous crystallites are analysed to result from a locally enhanced barrier to nucleation and might reveal sor characteristics of the crystallization

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confidence: 80%

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

et al. 2013

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“…The microstrain was assessed from the integral breadths (β) of YBCO K α1 00 l peaks following the Williamson–Hall approach as described by Scardi et al Namely, the reciprocal integral breadths β* = 2βλ cos θ (λ is the wavelength, and θ is the Bragg angle) were plotted as a function of the reciprocal spacing d * = 2 sin θ/λ and fit with the linear function β* = 1/ L 00 l + 2ε 00 l , yielding the average crystalline size ( L 00 l ) and microstrain (ε 00 l ) along the c axis. The epitaxial fraction (EF)the ratio of epitaxial YBCO to the total amount of material in the filmwas assessed by comparing the spatial and over 2θ integrated intensities of the 005 reflection of the YBCO film under study with similar data for the standard (005 reflection of the 200 ± 10-nm-thick pulsed-laser-deposited YBCO film), as described in detail by Rikel et al , The out-of-plane texture (Δω) was quantified by analyzing the full width at half-maximum of the 005 peak of YBCO.…”

Section: Methodsmentioning

confidence: 99%

High Critical Current Density and Enhanced Pinning in Superconducting Films of YBa₂Cu₃O_7−δ Nanocomposites with Embedded BaZrO₃, BaHfO₃, BaTiO₃, and SrZrO₃ Nanocrystals

Sierra

López-Domínguez

Rijckaert

et al. 2020

ACS Appl. Nano Mater.

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Chemical solution deposition (CSD) of YBa2Cu3O7−δ (YBCO) nanocomposites from colloidal precursor solutions containing double metal oxide preformed nanocrystals is a promising, costeffective and reproducible approach to produce superconducting films with high critical current density (Jc) and enhanced pinning. Here, the influence of the preformed nanocrystal composition on the microstructure and superconducting properties of the YBCO nanocomposite films is studied, with a focus on establishing a simple and scalable process to grow nanocomposites that can be transferred to grow nano-added coated conductors. Colloidal stable BaZrO3, BaHfO3, BaTiO3 and SrZrO3 nanocrystals (3-6 nm in diameter) were synthesized and added to an environment-friendly low-fluorine YBCO precursor solution. High-quality superconducting layers were grown on LaAlO3 single-crystal substrates from these four nanocomposite precursor solutions in a single deposition process, without the need of a seed layer, yielding Jc of 4-5 MA/cm² at 77 K in self-field. The different YBCO microstructures produced by the four types of nanocrystals and the resulting microstrain of the films are compared and related with the magnetic-field and angular dependence of Jc. We demonstrate the BaHfO3-containing nanocomposite as the best-performing with a homogeneous distribution of nanoparticles with 7 nm in average diameter and a high density of stacking faults, which leads to some of the best superconducting properties ever achieved via low-fluorine CSD. The Jc exhibits a much smoother decay in applied magnetic fields and a much more isotropic behaviour for non-parallel magnetic fields, and the pinning force is increased by a factor of 3.5 at 77 K and 1 T with respect to the pristine film.

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“…The inner zone is less dense because of the shrinkage inherent to the cooling in the melt casting process and does not present any particular texture either. Recent investigations on correlations between microstructure and superconducting properties have revealed that the partially textured zone has by far the largest critical current density [22].…”

Section: Methodsmentioning

confidence: 99%

“…Below 60 K, the critical current density in the Bi-2212 material is now higher than the one of Bi-2223 and the Bi-2223 hollow cylinder is thinner than the Bi-2212 tube by a factor of 3.3. Then, as an example, the studied magnetic screen made of Bi-2212 material is able to shield a magnetic field ten times higher than the Bi-2223 tube studied in [7] at 20 K. If one further considers that the current in the melt processed 2212 material is essentially carried within the partially textured zone of the cylinder wall [22], the difference is even more impressive.…”

Section: Temperature Dependence Of the Critical Current Densitymentioning

confidence: 97%

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Fagnard

Elschner

Böck

et al. 2010

Supercond. Sci. Technol.

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We show that tubes of melt cast Bi-2212 used as current leads for LTS magnets can also act as efficient magnetic shields. The magnetic screening properties under an axial DC magnetic field are characterized at several temperatures below the liquid nitrogen temperature (77 K). Two main shielding properties are studied and compared with those of Bi-2223, a material that has been considered in the past for bulk magnetic shields. The first property is related to the maximum magnetic flux density that can be screened, B lim ; it is defined as the applied magnetic flux density below which the field attenuation measured at the centre of the shield exceeds 1000. For a cylinder of Bi-2212 with a wall thickness of 5 mm and a large ratio of length over radius, B lim is evaluated to 1 T at T = 10 K. This value largely exceeds the B lim value measured at the same temperature on similar tubes of Bi-2223. The second shielding property that is characterized is the dependence of B lim with respect to variations of the sweep rate of the applied field, dB app /dt. This dependence is interpreted in terms of the power law E = E c (J/J c ) n and allows us to determine the exponent n of this E(J) characteristics for Bi-2212. The characterization of the magnetic field relaxation involves very small values of the electric field. This gives us the opportunity to experimentally determine the E(J) law in an unexplored region of small electric fields. Combining these results with transport and AC shielding measurements, we construct a piecewise E(J) law that spans over 8 orders of magnitude of the electric field.

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Development of All-CSD Processes for Coated Conductors at Nexans: Limitations and Possible Solutions

Cited by 7 publications

References 14 publications

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

High Critical Current Density and Enhanced Pinning in Superconducting Films of YBa₂Cu₃O_7−δ Nanocomposites with Embedded BaZrO₃, BaHfO₃, BaTiO₃, and SrZrO₃ Nanocrystals

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

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Development of All-CSD Processes for Coated Conductors at Nexans: Limitations and Possible Solutions

Cited by 7 publications

References 14 publications

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

Effect of twins in Ni substrates on the microstructure of La2Zr2O7 films for coated conductors

High Critical Current Density and Enhanced Pinning in Superconducting Films of YBa2Cu3O7−δ Nanocomposites with Embedded BaZrO3, BaHfO3, BaTiO3, and SrZrO3 Nanocrystals

Shielding efficiency andE(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields

Contact Info

Product

Resources

About

High Critical Current Density and Enhanced Pinning in Superconducting Films of YBa₂Cu₃O_7−δ Nanocomposites with Embedded BaZrO₃, BaHfO₃, BaTiO₃, and SrZrO₃ Nanocrystals