Fluorine-free propionate route for the chemical solution deposition of YBa2Cu3O7−x superconducting films

Nasui, M.; Petrișor, T.; Mos, R.B.; Gabor, M. S.; Mesaroş, A.; Goga, Firuţa; Ciontea, L.

doi:10.1016/j.ceramint.2014.11.132

Cited by 24 publications

(12 citation statements)

References 28 publications

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“…Additionally, FF precursors are more environmentally friendly than fluorinated precursors, because they do not generate hydrofluoric acid as a decomposition product. In particular, FF solutions based on acetate salts dissolved in excess propionic acid − have gained attention. In these solutions, exchange of acetate groups for propionates takes place, with formation of the corresponding propionate salts.…”

Section: Introductionmentioning

confidence: 99%

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth

et al. 2020

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Transient liquid-assisted growth (TLAG) is a non-equilibrium ultrafast method to grow YBa2Cu3O7–x (YBCO) superconducting films at up to 100 nm/s using chemical solution deposition. In this work, we study the formation of non-equilibrium crystalline intermediate phases prior to the growth of YBCO through TLAG. We analyze the thermal decomposition and microstructural evolution of a propionate-based fluorine-free solution used as precursor to YBCO epitaxial films. Thermal analyses (TGA, DSC), coupled with techniques to monitor the volatiles (TG-IR), were applied in situ during film pyrolysis in humid O2, while the thermal evolution of the solid residue was characterized by infrared spectroscopy and X-ray diffraction, both ex situ and in situ in synchrotron radiation sources, and by scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) cross-sectional analysis. Unexpected effects, observed during the decomposition of the ternary solution, are the formation of intermediate non-equilibrium phases: Cu2O or Cu(0) and monoclinic BaCO3. We emphasize that working with anhydrous solutions and anhydrous deposition conditions promotes the formation of the expected equilibrium phases. Finally, in situ X-ray diffraction permits monitoring the influence of the non-equilibrium monoclinic BaCO3 phase on the formation of binary oxide phases, precursors of TLAG YBCO film growth. Understanding the evolution of non-equilibrium phases is shown to be fundamental for the control of the final YBCO film’s microstructure and performance, since the latter are strongly affected by the film’s thermal history after solution deposition.

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Section: Introductionmentioning

confidence: 99%

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth

et al. 2020

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“…Barium propionate (Ba(CH3CH2CO2)2, BaProp2) and barium acetate (Ba(CH3CO2)2, BaAc2) find application in the field of ceramic film synthesis through chemical methods, along with similar short chain carboxylate salts of other metals. In particular, they are some of the precursors to YBa2Cu3O7-∂ (YBCO) [1,2], a high temperature superconductor, obtained from fluorine-free (FF) [3][4][5][6] and low fluorine [7] chemical methods. In fact, there are different precursor solutions for the synthesis of YBCO, which, classified with respect to the fluorine content in the metalorganic salt [8], can either be FF (fluorine-free), low fluorine [7] or all fluorine (TFA, trifluoroacetate route) [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, there are different precursor solutions for the synthesis of YBCO, which, classified with respect to the fluorine content in the metalorganic salt [8], can either be FF (fluorine-free), low fluorine [7] or all fluorine (TFA, trifluoroacetate route) [9][10][11]. In particular, the latter is a well-known route which permitted to overcome [12] the problem of BaCO3 formation as an undesired intermediate coming from pyrolysis of FF precursors like acetates and propionates [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Radical and oxidative pathways in the pyrolysis of a barium propionate-acetate salt

Rasi

Ricart

Obradors

et al. 2019

Journal of Analytical and Applied Pyrolysis

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Film and powder samples from a BaAc2 solution in propionic acid/MeOH were decomposed in different atmospheres and their thermal decomposition was characterized by means of thermogravimetry coupled with evolved gas analysis techniques (TG-FTIR, EGA-MS) and chemical and structural methods (EA, XRD, FTIR). The thermal behavior of the films was found to be different than the corresponding powder, in terms of volatiles, kinetics, intermediate phases and purity of final product. The mixed Ba-Prop-Ac salt obtained from solution decomposes to BaCO3 before 400°C through oxidative degradation, and above 400°C in inert atmosphere through a radical path releasing symmetrical ketones. Its double melting behavior is also highlighted and its decomposition understood by comparison with BaProp2 and BaAc2 precursors, and put into context of YBa2Cu3O7-∂ (YBCO) film pyrolysis.

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“…However, one of the major drawbacks of this method is the liberation of toxic HF during the YBCO pyrolysis/crystallization steps [5]. Continuous efforts are being carried out in the development of low-fluorine (see for example [6,7]) and fluorine-free chemical solution deposition processes [8][9][10][11][12]. These approaches consist of dissolving carboxylates, such as acetates, propionates, etc., or β-diketonates, as metal precursors in a common solvent, usually organic acids, and combining the solutions to yield the desired stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Development of a Fluorine-Free Polymer-Assisted-Deposition Route for YBa2Cu3O7−x Superconducting Films

et al. 2020

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Polymer assisted deposition (PAD) was used as an environmentally friendly, non-fluorine, growth method for superconducting YBa2Cu3O7−x (YBCO) films. The kinetics of the thermal decomposition of the precursor powder was studied by thermogravimetry coupled with mass spectrometry (TG-QMS). YBCO films were spin coated on (100) SrTiO3 (STO) single crystalline substrates, followed by a single step thermal treatment under wet and dry O2 and O2/N2 mixture. The as-obtained films were epitaxially grown having a [001]YBCO||[001]STO out-of-plane epitaxial relationship and exhibited good superconducting properties with Tc (R = 0) > 88 K, transition widths, ΔT ≈ 2 K and critical current densities as high as 2.3 MA/cm2 at 77 K and self magnetic field.

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Fluorine-free propionate route for the chemical solution deposition of YBa2Cu3O7−x superconducting films

Cited by 24 publications

References 28 publications

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth

Radical and oxidative pathways in the pyrolysis of a barium propionate-acetate salt

Development of a Fluorine-Free Polymer-Assisted-Deposition Route for YBa2Cu3O7−x Superconducting Films

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Fluorine-free propionate route for the chemical solution deposition of YBa2Cu3O7−x superconducting films

Cited by 24 publications

References 28 publications

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa2Cu3O7–x Film Growth by Transient Liquid-Assisted Growth

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa2Cu3O7–x Film Growth by Transient Liquid-Assisted Growth

Radical and oxidative pathways in the pyrolysis of a barium propionate-acetate salt

Development of a Fluorine-Free Polymer-Assisted-Deposition Route for YBa2Cu3O7−x Superconducting Films

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Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth

Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa₂Cu₃O_7–x Film Growth by Transient Liquid-Assisted Growth