Conversion behavior comparison of TFA–MOD and non-fluorine solution-deposited YBCO films

Wesolowski, Daniel Edward; Patta, Yoda Rante; Cima, Michael J.

doi:10.1016/j.physc.2009.04.008

Cited by 24 publications

(23 citation statements)

References 35 publications

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“…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]. 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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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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“…Also the literature shows differences in the temperature range in which the last stage takes place, reporting complete decomposition at 600°C [16][17][18], 700°C [17] or even at 1350°C [19]. Besides, despite the fact that water vapor is commonly used in the synthesis of YBCO FF tapes, none of the published papers analyze the effect of the presence of water vapor in the thermal decomposition of the metalorganic precursor [3,20].…”

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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“…1 Promising results using non-fluorine YBCO precursor solutions in a polymer-assisted deposition method (PAD) or by using trimethylacetates as metal salts were also published. [4][5][6][7] In the sol-gel systems that were previously published by our group, a highly viscous network is formed, e.g., by the addition of concentrated liquid amines to avoid the precipitation of the metal ions. Even at high concentrations, these metal ions remain captured in the so-called microcavities and the homogeneity is presented in a non-classical gel state.…”

Section: Introductionmentioning

confidence: 99%

Complexation behavior in aqueous edta sol-gel systems for the synthesis of YBa2Cu3O7-x high-temperature superconductors

Thuy¹,

Herman²,

Lommens³

et al. 2012

J. Braz. Chem. Soc.

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Duas soluções à base de água contendo precursores do óxido YBa 2 Cu 3 O 7-x e utilizando edta (ácido etilenodiaminotetra-acético) como agente complexante são apresentadas. Estes precursores foram usados na deposição de camadas finas de materiais supercondutores de altas temperaturas (HTSC). A influência do comportamento da complexação na formação de soluções e de géis transparentes e homogêneos após a combinação de acetatos de metais e outros modificadores foi estudada, comparada e interpretada utilizando equilíbrios metal-ligante. A ocorrência de diferentes espécies químicas em diferentes valores de pH pode estar relacionada às condições de formação de géis estáveis. Os precursores foram utilizados na deposição de filmes finos supercondutores texturizados por dip coating. A análise por difratometria de raios X de pó (XRD) indicou que uma única fase YBCO (óxido de ítrio, bário e cobre) foi obtida. A técnica de espectroscopia no infravermelho por refletância total atenuada (ATR-FTIR) foi utilizada para determinar o nível de carbono residual nos materiais YBCO finais, que foi menor do que 0,01%.Two water-based YBa 2 Cu 3 O 7-x precursor solutions using edta (ethylenediaminetetraacetic acid) as complexing agent are presented. These precursors were employed to deposit thin layers of high-temperature superconducting (HTSC) materials. The influence of the complexation behavior on the formation of transparent and homogeneous solutions and gels after the combination of metal acetates and other modifiers was studied, compared and interpreted using metal-ligand equilibria. The occurrence of different chemical species at different pH values appears to be related to stable gel formation conditions. It is found that both acetic acid and edta play an important role in controlling the condensation reaction to form a continuous network polymer. The precursors were used to deposit textured superconducting thin films on SrTiO 3 (STO) substrates by dip coating. Analysis by X-ray diffractometry (XRD) indicated that a single YBCO (yttrium barium copper oxide) phase was obtained. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was used to determine the carbon residue level in the YBCO final materials, which was lower than 0.01%.

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Conversion behavior comparison of TFA–MOD and non-fluorine solution-deposited YBCO films

Cited by 24 publications

References 35 publications

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

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

Thermal decomposition of yttrium propionate: film and powder

Complexation behavior in aqueous edta sol-gel systems for the synthesis of YBa2Cu3O7-x high-temperature superconductors

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