Improved REBa2Cu3O7−x (RE = Y, Gd) structure and superconducting properties by addition of acetylacetone in TFA-MOD precursor solutions

Erbe, Manuela; Hänisch, Jens; Freudenberg, Thomas; Kirchner, Alexander; Mönch, Ingolf; Kaskel, Stefan; Schultz, L.; Holzäpfel, B.

doi:10.1039/c3ta15243j

Cited by 48 publications

(69 citation statements)

References 37 publications

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“…Then, taking into account the principle of "like dissolves like" [19] we need the use of different additives or solvent mixtures, which are able to change solutes solubility parameters, for the stabilization of the solutions. These additives are mainly composed by carbon backbone molecules functionalized with alcohol, amine, ether carbonyl and carboxyl groups, isolated or mixed together [20] [7]. Possible reactions of the additives with the YBCO precursors need to be considered because the stability of the resulting solutions is clearly related to the solubility of products or complexes formed.…”

Section: Resultsmentioning

confidence: 99%

“…This barium fluoride process, although currently used for industrial companies in the development of longlength biaxially textured coated conductors is still deeply studied, especially to better understand the underlying decomposition and growth mechanisms and be able to further improve growth rates, thickness, throughputs and performance [5]. This includes, among others, study of the deposition, evaporation, shrinkage and decomposition step, especially for thick layers and correlate them with the use of modified starting solutions [6] [7]. In addition, the nucleation and growth mechanisms for this modified solutions should be further analyzed to ensure best performance.…”

Section: Introductionmentioning

confidence: 99%

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Solution design for low-fluorine trifluoroacetate route to YBa₂Cu₃O₇films

Palmer

Pop

Eloussifi

et al. 2015

Supercond. Sci. Technol.

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In the context of CSD-MOD growth of coated conductors for low cost and scalable production of YBCO coated conductors, new solutions are proposed in accordance with the new requirements concerning environmental safety and product performance. Looking at these objectives we will present here our work in the preparation of metallorganic precursor solutions with reduced fluorine content, which fulfill the requirements of superconducting YBCO epitaxial layers, leading to high superconducting performance. Solutions with low fluorine precursors with different solvents and amounts of additives have been stabilized and their rheology modified for substrate wettability. Thermal decomposition analysis and infrared spectroscopy performed directly in films, have revealed the different decomposition steps and NMR analysis could unveil the chemical reactions taking place in the solution. Upon optimization of the growth process parameters, T c and J c (77K) of 90 K and 3-4 MA/cm 2 are obtained.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solution design for low-fluorine trifluoroacetate route to YBa₂Cu₃O₇films

Palmer

Pop

Eloussifi

et al. 2015

Supercond. Sci. Technol.

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“…Moreover, the J c of thick multilayer YBCO films prepared using the F/Ba = 4 and 6 sols decreases greatly with the increase of film thickness. The reason is that the high fluorine content in the coated films arouses many defects and produces more corrosive HF gas and finally leads to large amount of macro-pores inside the films [18,29,30].…”

Section: Resultsmentioning

confidence: 99%

Ultralow-fluorine sol–gel deposition of thick YBCO multilayer films

Bian

Chen

et al. 2015

J Sol-Gel Sci Technol

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Three kinds of low-fluorine YB 2 Cu 3 O 7-x (YBCO) starting sols with F/Ba = 6, 4 and 2 were applied to fabricate multilayer YBCO films on LaAlO 3 substrates by multi-coating technique. Influence of the fluorine content in the sols and the thickness of single-coated layer on the properties of multilayer YBCO films was discussed in detail. The critical current density (J c ) of multilayer YBCO films derived from F/Ba = 6 and 4 sols dropped sharply with thickness. However, using sol with F/Ba = 2, the J c of multilayer films decreased slowly with thickness. Moreover, the thinner the single-coated film, the less the amount of a-axis-oriented grains inside the multilayer films, resulting in the improvement in J c of the final thick films. Through multi-coating technique, YBCO films as thick as 1.1-1.2 lm were prepared. The J c of the optimized thick YBCO films reached a high value of 4.23MA/cm 2 at 77 K, 0T. Graphical Abstract Compared with the YBCO films derived from other low-fluorine sols, the YBCO films prepared using the ultralow-fluorine sol with mole ratio of F/Ba = 2 show the higher superconducting current transportation ability. Using this solution, the ''thickness effect'' of multilayer thick YBCO films is degraded obviously. Moreover, lowering the thickness of every layer film through controlling the withdrawal speed can also suppress the formation of a-axis grains, thus enhancing the critical current density of final thick YBCO films.

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“…[1,4]. Metal-organic deposition (MOD), as an alternative of the CSD method, uses metal alkoxides, carboxylates (acetates, trifluoroacetates, propionates, and naphthenates) and acetylacetonates as precursors [1,[5][6][7][8][9][10][11][12]. The use of polar solvents with free hydroxyl group (e.g.…”

Section: Introductionmentioning

confidence: 99%