Evolution of yttrium trifluoroacetate during thermal decomposition

Eloussifi, Hichem; Farjas, Jordi; Roura, P.; Camps, Jaume; Dammak, M.; Ricart, Susagna; Puig, T.; Obradors, X.

doi:10.1007/s10973-011-1899-5

Cited by 47 publications

(33 citation statements)

References 21 publications

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“…In this case, bands derived from carbon dioxide (2359 and 688 cm -1 ) were observed in the maximum decomposition rate. The second main volatile product was CF 3 CFO, which was also identified in earlier studies concerning transitions metals trifluoroacetates [22,23]. This assumption is confirmed by the presence of bands at: 1896, 1240, 1210 and 1097 cm -1 [24,25].…”

Section: Tg-ir Resultssupporting

confidence: 78%

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Szczęsny

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2012

J Therm Anal Calorim

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The thermal decomposition reactions of CH 3 CH 2 C(CH 3 ) 2 COOAg (1), (CH 3 ) 3 SiCH 2 COOAg (2), CF 3 COOAg (3), (CH 3 ) 3 CCOOAg (4), C 2 H 5 COOAg (5), C 3 F 7 COOAg (6), C 6 F 13 COOAg (7) and (CF 2 ) 3 (COOAg) 2 (8) were studied in N 2 atmosphere using thermogravimetry (TG), derivative thermogravimetry and differential thermal analysis. Characterized compounds decomposed in one-or multistep processes with metallic silver formation in the range 215-465°C. TG-IR studies of gases evolved during thermolysis revealed products of decomposition, such as carbox ylic acids, CO 2 and recombination reactions.

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Section: Tg-ir Resultssupporting

confidence: 78%

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Szczęsny

Szłyk

2012

J Therm Anal Calorim

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“…The FTIR spectrum accounts for the presence of TFA ligands in different bonding modes, most notably a strong broad absorption in the 1732-1622 cm -1 region centered at 1685 cm -1 and strong absorptions centered at 1208 cm -1 and 1150 cm -1 [32][33][34][35] [36]. In addition, a broad band in the 3050-3700 cm -1 region centered at 3433 cm -1 is related to water [32][33][34]. FTIR spectra show a progressive diminution of the absorption peaks related to propionate groups from 200ºC up to 300ºC while TFA absorption peaks remain unaffected up to 300ºC, and at 320ºC there is a significant diminution of the amplitude of TFA absorption peaks.…”

Section: Thermogravimetric and Evolved Gas Analysismentioning

confidence: 99%

Solution design for low-fluorine trifluoroacetate route to YBa₂Cu₃O₇films

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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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“…The different behaviour of films can be explained by the fact that, thanks to the enhanced gas transport of volatiles or reactive gases, intermediate products tend to be less stable in films than in powders. In the particular case of metal fluorides, it has been shown that they decompose by reaction with water vapour and that the rate-limiting step is HF out-diffusion [35]. Therefore, its faster diffusion in films explains their lower decomposition temperature.…”

Section: Iii5-stability Of Intermediate Products: Metal Fluorides Amentioning

confidence: 99%

Thermal analysis of metal organic precursors for functional oxide preparation: Thin films versus powders

et al. 2015

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The thermal decomposition of several metal organic precursors, used in the preparation of YBa 2 Cu 3 O 7-x superconducting coated conductors (Cu acetate, Cu, Y and Ba trifluoroacetates and Ce propionate) is analyzed by means of several thermoanalytical techniques (TG/DTA, MS and DSC). In all cases, the metal organic precursors deposited as thin films decompose differently than powders from the same precursors. In thin films, decomposition is facilitated by the easier transport of reactive gas from the surrounding atmosphere and by the easier out-diffusion of volatile products. Consequently, films decompose at lower temperature and are more sensitive to the presence of any residual reactive gas in the furnace. Good thermal contact with the substrate is also shown to minimize overheating in films and avoid combustion processes that are otherwise often observed during the thermal decomposition of powders. Finally, the formation and stability of intermediate products towards the oxide formation, such as metal fluorides, differs in films because of the easier gas exchange. With respect to powders, these compounds are much less stable in films, where their decomposition temperature can be lowered by several hundreds of degrees Celsius. While in some cases the behaviour of films can be predicted by analyzing varying masses of precursor powders, this is not always the case. Therefore, thermal analysis carried out on films is recommended to avoid erroneous conclusions about materials preparation drawn from powders.

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Evolution of yttrium trifluoroacetate during thermal decomposition

Cited by 47 publications

References 21 publications

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Solution design for low-fluorine trifluoroacetate route to YBa₂Cu₃O₇films

Thermal analysis of metal organic precursors for functional oxide preparation: Thin films versus powders

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Evolution of yttrium trifluoroacetate during thermal decomposition

Cited by 47 publications

References 21 publications

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Thermal decomposition of some silver(I) carboxylates under nitrogen atmosphere

Solution design for low-fluorine trifluoroacetate route to YBa2Cu3O7films

Thermal analysis of metal organic precursors for functional oxide preparation: Thin films versus powders

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Solution design for low-fluorine trifluoroacetate route to YBa₂Cu₃O₇films