Reactions of oxyfluoride precursors for the preparation of barium yttrium cuprate films

Yoshizumi, M.; Seleznev, I.; Cima, Michael J.

doi:10.1016/j.physc.2003.12.004

Cited by 67 publications

(77 citation statements)

References 17 publications

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“…The presence of a liquid phase in the YBCO conversion process has been inferred or observed by others. [43,44,63,73,78,81,82] The lateral growth of the YBCO phase is particularly illustrated by the micrograph of Figure 3f and the spectral imaging of the chemistry around the growing YBCO grains as illustrated in Figure 4. The lateral growth of YBCO grains approximately 0.1 to 0.3 lm in thickness also gives rise to grain boundary meandering and overgrowth and the stepped nature of these grain boundaries as shown in Figure 5.…”

Section: Nucleation and Growthmentioning

confidence: 98%

“…[41,42] The MOD film microstructure results from a liquid-assisted, lateral growth mode of the film grains. [43,44] In contrast, the PLD film has a columnar grain structure typical of in situ PVD processes for YBCO films that develop via the Stranski-Krastanov growth mode. [28,45] Depending upon the growth conditions, small amounts of a liquid phase can sometimes be present at the growth front in PVD processes.…”

Section: Process Dependent Microstructuresmentioning

confidence: 99%

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Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

et al. 2008

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High critical current densities (Jc) in thick films of the Y1Ba2Cu3O7–δ (YBCO, Tc ≈ 92 K) superconductor directly depend upon the types of nanoscale defects and their densities within the films. A major challenge for developing a viable wire technology is to introduce nanoscale defect structures into the YBCO grains of the thick film suitable for flux pinning and the tailoring of the superconducting properties to specific, application‐dependent, temperature and magnetic field conditions. Concurrently, the YBCO film needs to be integrated into a macroscopically defect‐free conductor in which the grain‐to‐grain connectivity maintains levels of inter‐grain Jc that are comparable to the intra‐grain Jc. That is, high critical current (Ic) YBCO coated conductors must contain engineered inhomogeneities on the nanoscale, while being homogeneous on the macroscale. An analysis is presented of the advances in high‐performance YBCO coated‐conductors using chemical solution deposition (CSD) based on metal trifluoroacetates and the subsequent processing to nano‐engineer the microstructure for tuneable superconducting wires. Multi‐scale structural, chemical, and electrical investigations of the CSD film processes, thick film development, key microstructural features, and wire properties are presented. Prospects for further development of much higher Ic wires for large‐scale, commercial application are discussed within the context of these recent advances.

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Section: Nucleation and Growthmentioning

confidence: 98%

Section: Process Dependent Microstructuresmentioning

confidence: 99%

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

et al. 2008

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“…However, a major drawback of this route is that the decomposition of the intermediate BaF 2 involves the release of Hydrofluoric acid (HF). It has been stated that out-diffusion of HF is the limiting step in obtaining YBCO during the growth stage [6][7][8][9]. The thicker the film, the more difficult HF removal is, so it is not possible to obtain a fast growth rate in thick films through the TFA route.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of yttrium propionate: film and powder

Rasi

Ricart

Obradors

et al. 2018

Journal of Analytical and Applied Pyrolysis

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A B S T R A C TThe processes involved in the thermal decomposition of yttrium propionate in oxidizing and inert atmosphere were analyzed with thermoanalytical techniques (thermogravimetry and evolved gas analysis) and with the help of structural characterization (X-ray diffraction, infrared spectroscopy and elemental analysis) of intermediate and final products. Samples in the form of films and powders were analyzed. The decomposition behavior studied as a function of particle size and film thickness was investigated. We conclude that, as a consequence of the gas and heat transport, films decompose differently than powders. Finally, two decomposition mechanisms are proposed that are in agreement with the observed volatiles and intermediate phases.

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“…Conversion rates limited to are considered inefficient for scale-up. On the other hand, 10-50 times faster conversion rates have been reported for a close variant of the PVD process, where the precursor layers were produced by metal-organic deposition (MOD) of trifluoroacetate solutions [6], [7]. An enhanced porosity of MOD precursors has been proposed as a possible cause of the rate disparity, by enabling faster diffusion of gaseous reactant and product (HF) species through the precursor layer.…”

Section: Introductionmentioning

confidence: 99%

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

Feenstra

Gapud

List

et al. 2005

IEEE Trans. Appl. Supercond.

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Implementation of improved processing for BaF 2 ex situ YBCO coatings from e-beam evaporated precursors enables faster conversion with rates up to 12 A s and critical currents I c at 77 K greater than 350 A/cm-width on a RABiTS template. Details of the faster processing are described and compared to an earlier slower process. A linear relation between I c and YBCO layer thickness provides evidence of new opportunities to further improve I c .

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Reactions of oxyfluoride precursors for the preparation of barium yttrium cuprate films

Cited by 67 publications

References 17 publications

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Thermal decomposition of yttrium propionate: film and powder

Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

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Reactions of oxyfluoride precursors for the preparation of barium yttrium cuprate films

Cited by 67 publications

References 17 publications

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Progress in Nanoengineered Microstructures for Tunable High‐Current, High‐Temperature Superconducting Wires

Thermal decomposition of yttrium propionate: film and powder

Critical Currents&lt;tex&gt;$rm I_rm c(77 rm K)≫350 rm A/cm$&lt;/tex&gt;-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process

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Critical Currents<tex>$rm I_rm c(77 rm K)≫350 rm A/cm$</tex>-Width Achieved in Ex Situ YBCO Coated Conductors Using a Faster Conversion Process