A Modular <i>Ex Situ</i> Conversion Process for Thick MOD-Fluoride RBCO Precursors

Feenstra, R.; List, F.A.; Li, Xiaoping; Rupich, M.W.; Miller, Dean J.; Maroni, V.A.; Zhang, Y.; Thompson, J.R.; Christen, D. K.

doi:10.1109/tasc.2009.2019215

Cited by 16 publications

(28 citation statements)

References 23 publications

(30 reference statements)

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“…To complete the growth of the whole film thickness one can in principle use different processing conditions during the nucleation and growth steps [12,25,39,73,74]. This usually allows to control separately the supersaturation conditions during nucleation (determining the crystalline orientation) from the growth step conditions of the rest of the film (determining the growth rate).…”

Section: Nucleation and Growth Of Nanocomposite Thick Filmsmentioning

confidence: 99%

Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

Obradors

Puig

et al. 2018

Supercond. Sci. Technol.

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Superconducting nanocomposites are the best material choice to address the performances required in power applications and magnets working under high magnetic fields. However, it is still challenging to sort out how to achieve the highest superconducting performances using attractive and competitive manufacturing processes. Colloidal solutions have been recently developed as a novel and very promising low-cost route to manufacture nanocomposite coated conductors. Well dispersed and stabilized preformed nanoparticle solutions are first prepared with high concentrations and then mixed with the YBa 2 Cu 3 O 7 metalorganic precursor solutions to generate colloidal solutions to grow the nanocomposite films. Here we demonstrate, for the first time, that non-reactive BaZrO 3 and BaHfO 3 perovskite nanoparticles are suitable for growing high quality thin and thick films and coated conductors with a homogeneous distribution and controlled particle size. Additionally, we extend the nanoparticle content of the nanocomposites up to 20-25 % mol without any degradation of the superconducting properties. Thick nanocomposite films, up to 0,8 µm, have been prepared with a single deposition of low-fluorine solutions using an Ink-Jet Printing dispenser and we demonstrate that the preformed nanoparticles display only a very limited coarsening during the growth process and so high critical current densities J c (B) under high magnetic fields. These films show the highest critical currents achieved so far based on the colloidal solution approach, I c = 220 A/cm-w at 77 K and self-field, and they still have a high potential for further increase of the film thickness. Finally, we also show that nanocomposite YBa 2 Cu 3 O 7-BaZrO 3 coated conductors based on Alternating Beam Assisted Deposited YSZ buffer layer on Stainless Steel metallic substrates can be developed based on these novel colloidal solutions. Non-reactive preformed oxide perovskite nanoparticles are therefore very promising elements to further advance the colloidal solution approach in the implementation of low-cost and high-performance coated conductors for high magnetic field applications.

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Section: Nucleation and Growth Of Nanocomposite Thick Filmsmentioning

confidence: 99%

Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

Obradors

Puig

et al. 2018

Supercond. Sci. Technol.

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“…Second, lowering the fluorine content could lead to a lower F/Ba ratio in the as-pyrolyzed films, which might be profound in the YBCO thick film fabrication. In the multi-coated MOD-YBCO thick film research by Li et al [12] and Feenstra et al [13], a modification for lowering the F/Ba ratio prior to the crystallization step was proposed, based on the hypothesis of transient liquid phase during the crystallization [14,15]. In their studies, lowering the F/Ba ratio was achieved by altering the water partial pressure and heating rate [12], or by inserting a medium-temperature anneal (<650 • C, 60 min) named as "F-Module" between pyrolysis and crystallization [13].…”

Section: Introductionmentioning

confidence: 99%

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Feng

Zhao

et al. 2014

Supercond. Sci. Technol.

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In the reported low-fluorine MOD-YBCO studies, the lowest F/Ba mole ratio of the precursor solution was 4.5. However, further lowering the F/Ba ratio is important according to the researches of YBCO thick film. On the other hand, the F/Ba ratio is necessary to be at least 2 for the full conversion of the Ba precursor to BaF2 to avoid the formation of BaCO3, which is detrimental to the superconducting performance. In this study, a novel solution with the F/Ba mole ratio of 2 was developed, in which the fluorine content was only about 10.3% of that used in the conventional TFA-MOD method. Attenuated total reflectance-Fourier transformed-infrared spectra(ATR-FT-IR) revealed that BaCO3 was remarkably suppressed in the as-pyrolyzed film and eliminated at 700 • C. Thus YBCO films with a critical current density (Jc) over 5 MA cm −2 (77 K, 0 T, 200 nm thickness) could be obtained on LAO single crystal substrates. In-situ FT-IR spectra showed that no obvious fluorinated gaseous by-products were detected in the pyrolysis step, which indicated that all of the F atoms might remain in the film as fluorides. X-ray diffraction (XRD) θ/2θ scan showed that BaF2, but neither YF3 nor CuF2, was detected in the films quenched at 400 -800 • C. The formation priority of BaF2 over YF3 and CuF2 was interpreted by the chemical equilibrium of the potential reactions. Our study could enlarge the synthesis window of the precursor solution for MOD-YBCO fabrication and open a gate to study the fluorine content in the precursor solution continuously and systematically.

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“…24 Actually, it has been previously reported that under high growth rate conditions non-c-axis oriented YBCO nucleation occurs, leading to an obvious degradation of superconducting properties, and usually achieving high J c YBCO films with a single growth step requires R to be less than 0.2 to 0.3 nm/s 21 and higher growth rates require complex processing steps. 25 To explore the potential of producing high-performance YBCO films under low total pressure conditions, we need to understand the influence of the processing parameters on the nucleation step and to correlate them with the film microstructure and the superconducting properties. For that reason in this work we investigate relatively thin ($400 nm) films.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and growth rate influence on microstructure and critical currents of TFA-YBa₂Cu₃O₇ under low-pressure conditions

et al. 2010

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The effects of variable conversion parameters on the microstructure and critical currents of TFA-derived YBa 2 Cu 3 O 7 (YBCO) films annealed under low-pressure conditions were investigated, accompanied by the analysis of their relationship with the nucleation process and the growth rate. It is found that non-c-axis oriented YBCO grains are formed under high supersaturation conditions, i.e., by increasing oxygen pressure, water pressure, or temperature. The optimal P H 2 O -P O 2 window for preparation of completely c-axis oriented YBCO films expands as the total pressure rises from 50 to 100 mbar due to the decrease of supersaturation at enhanced total pressure; the corresponding maximum growth rate is only slightly increased up to 0.6 nm/s. Additionally, it is shown that the gas flow needs to be high enough to avoid random nucleation of YBCO grains. A single gas-flowwater-pressure diagram, showing simultaneously the film-growth rate, allows visualizing the cross-linked influence of processing parameters to achieve c-axis oriented YBCO films with J c above 1 MA/cm 2 in one single growth step.

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A Modular Ex Situ Conversion Process for Thick MOD-Fluoride RBCO Precursors

Cited by 16 publications

References 23 publications

Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Nucleation and growth rate influence on microstructure and critical currents of TFA-YBa₂Cu₃O₇ under low-pressure conditions

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A Modular Ex Situ Conversion Process for Thick MOD-Fluoride RBCO Precursors

Cited by 16 publications

References 23 publications

Epitaxial YBa2Cu3O7−xnanocomposite films and coated conductors from BaMO3(M= Zr, Hf) colloidal solutions

Epitaxial YBa2Cu3O7−xnanocomposite films and coated conductors from BaMO3(M= Zr, Hf) colloidal solutions

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Nucleation and growth rate influence on microstructure and critical currents of TFA-YBa2Cu3O7 under low-pressure conditions

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Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

Epitaxial YBa₂Cu₃O_7−xnanocomposite films and coated conductors from BaMO₃(M= Zr, Hf) colloidal solutions

Nucleation and growth rate influence on microstructure and critical currents of TFA-YBa₂Cu₃O₇ under low-pressure conditions