Chemical Solution Deposition (<scp>CSD</scp>)

Bäcker, Michael; Baumann, Annika; Brunkahl, Oliver; Erbe, Manuela; Schneller, Theodor

doi:10.1002/3527600434.eap807

Cited by 6 publications

(8 citation statements)

References 159 publications

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“…YBa 2 Cu 3 O 7−δ (YBCO)-coated conductors have an extraordinary electrical performance and power density ideal for more efficient and compact cables, power transformers, motors, and generators. , However, factors such as high cost, low availability, and reduction of the critical current density ( J c ) in the presence of moderate-to-high magnetic fields have prevented the expansion of coated conductors in the power market. − Chemical solution deposition (CSD) has the potential to fulfill the demand of high-quality epitaxial YBCO films with excellent performance and high throughput, while the addition of preformed nanocrystals can reduce the J c decay with a magnetic field. − CSD offers the potential to fabricate coated conductors with high deposition rates at moderate precursor and investment cost. However, when coated conductors operate in high magnetic fields, their performance is strongly reduced due to vortex motion. − The incorporation of artificial pinning centers in the form of nanoscale secondary phases has been proven to enhance vortex pinning, increasing the in-field J c as well as the J c isotropy with respect to the direction of the magnetic field. − In this respect, two approaches are possible: the in situ and ex situ formation of artificial pinning centers.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Chemical solution deposition (CSD) has the potential to fulfill the demand of high-quality epitaxial YBCO films with excellent performance and high throughput, while the addition of preformed nanocrystals can reduce the Jc decay with magnetic field. [4][5][6][7] CSD offers the potential to fabricate coated conductors with high deposition rates at moderate precursor and investment cost. However, when coated conductors operate in high magnetic fields, their performance is strongly reduced due to vortex motion.…”

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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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Section: Introductionmentioning

confidence: 99%

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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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“…Up to now, most of the textured superconducting YBCO thin films with a critical temperature of 93 K and the desired properties for a coated conductor architecture are realized via vacuum processes, such as pulsed laser deposition (PLD) and metal-organic chemical vapor deposition (MOCVD) [2][3][4]. These deposition methods require costly high-vacuum systems, which are not so attractive at the industrial scale [5]. Therefore, there is a great demand for the reduction of fabrication costs of YBCO-coated conductors.…”

Section: Introductionmentioning

confidence: 99%

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

et al. 2019

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To reduce the fabrication costs while maximizing the superconducting and pinning properties of YBa2Cu3O7−δ (YBCO) nanocomposite films, the drop-on-demand ink-jet printing technique was used to deposit colloidal YBCO inks onto LaAlO3 substrates. These inks containing preformed HfO2 nanocrystals were carefully adjusted, prior to the jettability, as the droplet formation depends on the rheological properties of the inks themselves. After carefully adjusting printing parameters, 450-nm thick pristine YBCO films with a self-field critical current density (Jc) of 2.7 MA cm−² at 77 K and 500-nm thick HfO2-YBCO nanocomposite films with a self-field Jc of 3.1 MA·cm−² at 77 K were achieved. The final HfO2-YBCO nanocomposite films contained dispersed BaHfO3 particles in a YBCO matrix due to the Ba2+ reactivity with the HfO2 nanocrystals. These nanocomposite films presented a more gradual decrease of Jc with the increased magnetic field. These nanocomposite films also showed higher pinning force densities than the pristine films. This pinning enhancement was related to the favorable size and distribution of the BaHfO3 particles in the YBCO matrix.

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“…Chemical solution deposition (CSD) 1 of trifluoroacetates (TFAs) is an established, cost-efficient, and easy-to-scale way to prepare biaxially textured superconducting REBa 2 Cu 3 O 7−x (REBCO, RE = rare earth) films. 2,3 This process generally comprises the following steps.…”

Section: Introductionmentioning

confidence: 99%

Improving CSD-Grown REBCO Thin Films by ACAC Addition to the Precursor Solution

et al. 2022

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Gd0.5Y0.5Ba2Cu3O7–x thin films have been grown from solutions of metal trifluoroacetates dissolved in methanol. These precursor solutions are well suited for chemical solution deposition because of their good wettability and long shelf lives. This could allow for high reproducibility of metalorganic decomposition and film growth if not counteracted by the highly hygroscopic nature of the solutions. Exposure to moist air can result in significant absorption of water with detrimental effects on microstructural film integrity, making the solutions and as-deposited films difficult to handle. To overcome this issue, acetylacetone (acac) has been introduced to the solutions as an additive. The complexing nature of this agent leads to strong interactions with the salts of Cu and the rare earth elements, reducing the sensitivity to humidity significantly. Films grown from acac-containing solutions are considerably smoother and denser, which in turn leads to enhanced current-carrying capabilities. To investigate the role of acac and its impact on the microstructure and superconducting properties of the films, infrared spectroscopy and thermogravimetry coupled with differential thermal analysis have been performed on different types of solutions and films with and without acac. The microstructural features of the films have been thoroughly compared by scanning electron microscopy. The superconducting properties, T c and J c, have been measured by inductive and resistive techniques. Particular focus has been put on the film characteristics that develop with varying amounts of moisture in the process gas during the decomposition of the metalorganic compounds.

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Chemical Solution Deposition (CSD)

Cited by 6 publications

References 159 publications

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

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

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

Improving CSD-Grown REBCO Thin Films by ACAC Addition to the Precursor Solution

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Chemical Solution Deposition (CSD)

Cited by 6 publications

References 159 publications

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

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

Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

Improving CSD-Grown REBCO Thin Films by ACAC Addition to the Precursor Solution

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

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