Thermoanalytical study of the formation mechanism of yttria from yttrium acetate

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

doi:10.1016/j.tca.2011.04.009

Cited by 26 publications

(12 citation statements)

References 34 publications

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“…Since removal of all organic material is important, usually short chain metal salts are the chosen starting material for the precursor solution. As both steps need to be optimized for the final film's properties and performance, an increasing number of studies can be found concerning growth analysis [5] and pyrolysis of metal salts like propionates and acetates of yttrium [6][7][8][9], copper [3,[10][11][12][13][14][15] and barium [16,17].…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Rasi

Silveri

Ricart

et al. 2019

Journal of Analytical and Applied Pyrolysis

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The thermal decomposition of CuProp2 in the form of film and powder was studied in different atmospheres by means of thermal analysis techniques (TG-MS, TG-IR, EGA), chemical-structural methods (FTIR, XRD, EA) and computational thermochemistry (VASP/PBE). The decomposition mechanism in terms of volatiles evolved was disclosed with the aid of ab-initio modeling; it was found to be dependent on the gas diffusion in and out of the sample and accelerated by a humid atmosphere. In films, the copper redox behavior showed sensitivity to the residual atmosphere. Finally, the role of the metal center is discussed in the frame of a general decomposition mechanism for metal propionates. Volatile species evolved during decomposition can be detected by means of thermogravimetry (TG) coupled with Evolved Gas Analysis (EGA), which mainly works by infrared (EGA-FTIR or TG-FTIR) or by mass spectrometry (EGA-MS or TG-MS) detection. In fact, by EGA-FTIR and EGA-MS, it was shown that the decomposition of propionates in inert atmospheres involves formation of radicals C2H5• and C2H5CO• (along with CO2) and their recombination to form a symmetrical ketone [20-22]. For longer chain salts such as Ca(II)decanoate, techniques like pyrolysis coupled to gas chromatography (GC) revealed a more complicated scenario where normal alkanes were found along with several symmetrical ketones [23]. For odd chain length of Cu(II)carboxylates like Cu(II)propionate, only MS has been used for the in-situ EGA analysis and 2-pentanone (asymmetrical ketone) was reported to be the main decomposition product [11]. Formation of this asymmetrical ke-tone implies cleavage of a CeC(C]O) bond, instead of the expected CeC(]O) and C(]O)eO bonds. Conversely, no ketones at all were observed for even chain carboxylates of copper(II) [24], mercury(II) [25] and silver(I) [26]. In fact, references [24,25] report on the

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Section: Introductionmentioning

confidence: 99%

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Rasi

Silveri

Ricart

et al. 2019

Journal of Analytical and Applied Pyrolysis

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“…[41] In contrast, yttrium oxide fluorides YO (3-z)/2 F z are more comprehensively investigated. Only the two binary compounds, yttrium acetate Y(CH 3 COO) 3 (z=0) and yttrium fluoride YF 3 (z=3), are known, and, for yttrium acetate different hydrates exist.…”

Section: Resultsmentioning

confidence: 99%

Nanoscopic yttrium oxide fluorides: non-aqueous fluorolytic sol–gel synthesis and structural insights by¹⁹F and⁸⁹Y MAS NMR

et al. 2015

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Nanoscopic yttrium acetate fluorides Y(CH(3)COO)(3-z)F(z) and yttrium oxide fluorides YO(3-z)/(2)F(z )were prepared with tunable Y/F molar ratios via the fluorolytic sol-gel route. All samples were characterized by X-ray diffraction, elemental analysis and thermal analysis. In addition, local structures of all samples were studied by (19)F MAS, (19)F-(89)Y CP MAS and (1)H-(89)Y CP MAS NMR spectroscopy and the respective chemical shifts are given. For both classes of compounds, only the fluorination using one equivalent of F (z = 1) leads to defined, well crystalline matrices: yttrium acetate fluoride Y(CH(3)COO)(2)F and r-YOF.

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“…The exceeding contribution of fragment m/z ¼ 58 is related to the simultaneous release of acetate to form acetone. 26,27 Acetone (coming from acetate) can be detected from the presence of m/z ¼ 58 and 43 with an expected ratio of I43/I58 ¼ 4 as shown in Scheme S3. † Also, the contribution of fragments m/z ¼ 30 and 42 is larger than expected; the higher amount of small fragments is due to an enhancement of spontaneous dissociation with temperature.…”

Section: Monovalent Species By Ega-msmentioning

confidence: 99%

Using evolved gas analysis – mass spectrometry to characterize adsorption on a nanoparticle surface

et al. 2019

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Thermoanalytical study of the formation mechanism of yttria from yttrium acetate

Cited by 26 publications

References 34 publications

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Nanoscopic yttrium oxide fluorides: non-aqueous fluorolytic sol–gel synthesis and structural insights by¹⁹F and⁸⁹Y MAS NMR

Using evolved gas analysis – mass spectrometry to characterize adsorption on a nanoparticle surface

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Thermoanalytical study of the formation mechanism of yttria from yttrium acetate

Cited by 26 publications

References 34 publications

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Thermal decomposition of CuProp2: In-situ analysis of film and powder pyrolysis

Nanoscopic yttrium oxide fluorides: non-aqueous fluorolytic sol–gel synthesis and structural insights by19F and89Y MAS NMR

Using evolved gas analysis – mass spectrometry to characterize adsorption on a nanoparticle surface

Contact Info

Product

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Nanoscopic yttrium oxide fluorides: non-aqueous fluorolytic sol–gel synthesis and structural insights by¹⁹F and⁸⁹Y MAS NMR