Decomposition processes and structural transformations of cerium propionate into nanocrystalline ceria at different oxygen partial pressures

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

doi:10.1007/s11051-011-0352-9

Cited by 25 publications

(18 citation statements)

References 27 publications

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“…2 and 3) [11,19]. Notice that powders decompose in air at a lower temperature when m i diminishes, and that decomposition begins at the same temperature as in the inert atmosphere when m i is high enough (see asymptotic behaviour in Fig.…”

Section: Iii1-transport Of Reactive Gas: Decomposition Of Ce Propiomentioning

confidence: 95%

“…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%

“…Decomposition of Au [27], Ni [28] and Ag acetates [29] in an inert atmosphere leads to the formation of metallic nanoparticles, whereas oxidation of Ce(III) into Ce(IV) is usually observed for ceria precursors even in an inert atmosphere [19]. The effect of oxidizing or reducing species produced during decomposition or coming from the furnace atmosphere will depend, in general, on their transport across the sample.…”

Section: Iii4-gas Exchange and Combustion: Reduction Of Cumentioning

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: Iii1-transport Of Reactive Gas: Decomposition Of Ce Propiomentioning

confidence: 95%

Section: Ii-experimentalmentioning

confidence: 99%

Section: Iii4-gas Exchange and Combustion: Reduction Of Cumentioning

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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“…4C). Since both powder and film are obtained from the same solution, this difference can be attributed to the fact that films are much more sensitive to residual atmospheres than powders [21,39]. The effect of the residual oxygen was confirmed by increasing the flow of nitrogen in the TG; the higher the nitrogen flow, the higher the amount of 3-pentanone and the smaller the formation of propionic acid.…”

Section: Thermal Decomposition At Atmospheric Pressure: Organic Ligandmentioning

confidence: 99%

“…However, β* does not reach completion in humid O 2 or in humid N 2 because, at higher temperatures, it is interrupted by the occurrence of β and α, respectively. Finally, in dry N 2 (C) and relatively thick films, 3-pentanone formation was observed with propionic acid and thus β and α (favored by the presence of residual O 2 and water vapor in the TG furnace) are competing, given the impossibility of creating a fully inert atmosphere in thin films [23,39].…”

Section: Thermal Decomposition At Atmospheric Pressure: Organic Ligandmentioning

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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TEM for Characterization of Nanocomposite Oxide Thin Films: A Case Study on Solution-Derived Lanthanum Strontium Manganites

Abellán

Moreno²,

Sandiumenge

et al. 2013

Transmission Electron Microscopy Characterization of Nanomaterials

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Decomposition processes and structural transformations of cerium propionate into nanocrystalline ceria at different oxygen partial pressures

Cited by 25 publications

References 27 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

Thermal decomposition of yttrium propionate: film and powder

TEM for Characterization of Nanocomposite Oxide Thin Films: A Case Study on Solution-Derived Lanthanum Strontium Manganites

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