The thermal decomposition of barium trifluoroacetate

Farjas, Jordi; Camps, Jaume; Roura, P.; Ricart, Susagna; Puig, T.; Obradors, X.

doi:10.1016/j.tca.2012.06.020

Cited by 39 publications

(46 citation statements)

References 20 publications

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“…DSC measurements show that the decomposition enthalpy is more exothermic in air by just the heat evolved during the oxidation of one mol of CO to CO 2 [20]. In other words, oxygen molecules do not participate in the primary decomposition reaction but in a secondary reaction with CO out of the sample.…”

Section: Iii2-evolution Of Gaseous Species: Decomposition Of Ba(tfa)mentioning

confidence: 99%

“…Ce propionate was synthesised from Ce acetate (see details in [19]) and Ba(TFA) 2 from Ba carbonate [20]. The powders were analysed inside alumina pans without cover to facilitate gases exchange (crucible section area, 0.2 cm 2 ).…”

Section: Ii-experimentalmentioning

confidence: 99%

“…One can see in Fig. 10b that BaF 2 begins to decompose above 1200ºC [20]. Furthermore, we have treated a powder mixture obtained by precipitation from a solution containing the Y and Ba TFA precursors with molar ratio Y:Ba = 1:2, because studies on the mechanism of YBCO formation [17] indicate that Y and Ba fluorides are less stable when obtained from the mixture.…”

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

confidence: 99%

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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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Section: Iii2-evolution Of Gaseous Species: Decomposition Of Ba(tfa)mentioning

confidence: 99%

Section: Ii-experimentalmentioning

confidence: 99%

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

confidence: 99%

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

et al. 2015

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“…Our own experiments with these substances give a range of Q/m i values of 10 2 -10 4 J/g [2,7,9]. On the other hand, consider a typical variation of the specific heat, (C A -C B )/m i , of 1 J/g/ºC.…”

Section: B) Overview Of Metal Organic Decomposition Processesmentioning

confidence: 99%

The effect of volatiles on the measurement of the reaction heat by differential scanning calorimetry

García

Sánchez-Rodríguez

López-Olmedo

et al. 2015

J Therm Anal Calorim

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When gases evolve during a chemical reaction, a fraction of the reaction heat is lost with them. We have analyzed, both theoretically and experimentally, the deviations that this effect can produce on the determination of the reaction heat by Differential Scanning Calorimetry (DSC). It is shown that, even in absence of gas overheating, deviations related to variations in the sample heat capacity can be substantial in experiments involving very intense DSC peaks.However, experiments performed on thermal decomposition of metalorganic salts and on evaporation of liquids have shown that deviations usually arise from gas overheating..

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“…The most cumbersome issue to achieve high-performance coated conductors (CC) has been to find a suitable methodology to grow epitaxial YBCO thin films and nanocomposites based on CSD on flexible metal substrates, and here, the greatest progress has been made based on the use of metal-trifluoroacetates (M-TFA) as metal-organic precursors [19][20][21][22]. The main advantage of these precursors is that they decompose in intermediate nanometric Cu and Y oxides and BaF 2 phases, thus avoiding the formation of BaCO 3 whose decomposition is cumbersome [23]. Chemical Solution Deposition is based on four processing steps schematically shown in Figure 6.1 and described in the following.…”

Section: Chemical Solution Deposition (Csd)mentioning

confidence: 99%

6. Vortex dynamics in nanofabricated chemical solution deposition high-temperature superconducting films

Palau¹,

Rouco²,

Luccas³

et al. 2017

Superconductors at the Nanoscale

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Artificial manipulation and control of vortex dynamics in YBa 2 Cu 3 O 7 (YBCO) films have always been a complex issue, especially since high thermal excitations but also strong vortex pinning capabilities coexist in this material. Thus, artificial nanofabrication strategies able to generate competing effects with intrinsic microstructural defects need to be achieved. Lithography tools are widely used to create model systems with controlled pinning potentials in superconductors. However, these techniques easily disturb the optimal oxygen film doping in YBCO films and consequently the overall performances degrades. We have optimized the use of two different high-resolution nanolithography approaches, Focused Ion Beam Milling and Electron Beam Lithography, to artificially and locally modify the pinning landscape of YBCO films grown by chemical solution deposition (CSD). Three different nanofabricated systems will be discussed, which resulted in ideal structures to manipulate vortex dynamics in CSD-YBCO thin films with strong intrinsic pinning centers. In particular, we observed artificial granularity effects, nanowall pinning, and positive and negative rectification effects. We will report on our understanding of all these effects and potential expectations. IntroductionYBa 2 Cu 3 O 7−d (YBCO) is⁴ the technologically most relevant high-temperature superconductor, highly explored for practical applications [1][2][3][4][5][6]. The achievement of artificial pinning centers (APC) in YBCO films is of major concern when pinning forces need to be optimized, in coated conductors (long-length epitaxial YBCO films on buffered flexible metallic substrates), or when they need to be exploited for electronic applications, requiring flux quanta manipulation. However, flux pinning in cuprate superconductors requires control of the defect structure on a nanometric scale and this is a cumbersome problem. The primary concern is to develop efficient techniques for

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The thermal decomposition of barium trifluoroacetate

Cited by 39 publications

References 20 publications

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

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

The effect of volatiles on the measurement of the reaction heat by differential scanning calorimetry

6. Vortex dynamics in nanofabricated chemical solution deposition high-temperature superconducting films

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