An in-depth in situ IR study of the thermal decomposition of yttrium trifluoroacetate hydrate

Mosiadz, M.; Juda, K.L.; Hopkins, Simon C.; Sołoducho, Jadwiga; Glowacki, B.A.

doi:10.1007/s10973-011-1772-6

Cited by 32 publications

(26 citation statements)

References 44 publications

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“…Similarly as in the case of presented SG1 powders, the 2‐degradation step during crystallization was also described by Farjas et al for Ba(CF 3 COO) 2 , where the direct crystallization of BaF 2 phase was preceded by pre‐decomposition of barium trifluoroacetate. Simultaneously, the one‐step decomposition with parallel crystallization of fluoride phase—as in the case of studied SG2 xerogels—was also demonstrated in available literature by Mosiadz et al when Y(CF 3 COO) 3 was successfully transformed into YF 3 .…”

Section: Resultsmentioning

confidence: 56%

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

et al. 2018

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In this work, silica powders and transparent glass‐ceramic materials containing LaF3:Eu3+ nanocrystals were synthesized using the low‐temperature sol‐gel technique. Prepared samples were characterized by TG/DSC analysis as well as X‐ray diffraction and IR spectroscopy. The transformation from liquid sols toward bulk powders and xerogels was also examined and analyzed. The optical behavior of prepared Eu3+‐doped sol‐gel samples were evaluated based on photoluminescence excitation (PLE: λem = 611 nm) and emission (PL: λexc = 393 nm, λexc = 397 nm) spectra as well as luminescence decay analysis. The series of luminescence lines located within reddish‐orange spectral scope were registered and identified as the intra‐configurational 4f6‐4f6 transitions originated from Eu3+ optically active ions (5D0 → 7FJ, J = 0‐4). Moreover, the R/O‐ratio was also calculated to estimate the symmetry in local framework around Eu3+ ions. The luminescence spectra and double‐exponential character of decay curves recorded for fabricated nanocrystalline sol‐gel samples (τ1(5D0) = 2.07 ms, τ2(5D0) = 8.07 ms and τ1(5D0) = 0.79 ms, τ2(5D0) = 9.76 ms for powders and glass‐ceramics, respectively) indicated the successful migration of optically active Eu3+ ions from amorphous silica framework to low phonon energy LaF3 nanocrystal phase.

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Section: Resultsmentioning

confidence: 56%

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

et al. 2018

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“…In the studies of the conventional 100% fluorine containing TFA-MOD solution, fluorine containing gaseous by-products were always detected during the pyrolysis step, indicating the loss of F atoms [24][25][26][27]. In this study, the fluorine content in the precursor solution was approximately the minimum requirement for the complete conversion of Ba content to BaF 2 .…”

Section: B In-situ Study Of Gaseous By-products During the Pyrolysismentioning

confidence: 66%

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Feng

Zhao

et al. 2014

Supercond. Sci. Technol.

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In the reported low-fluorine MOD-YBCO studies, the lowest F/Ba mole ratio of the precursor solution was 4.5. However, further lowering the F/Ba ratio is important according to the researches of YBCO thick film. On the other hand, the F/Ba ratio is necessary to be at least 2 for the full conversion of the Ba precursor to BaF2 to avoid the formation of BaCO3, which is detrimental to the superconducting performance. In this study, a novel solution with the F/Ba mole ratio of 2 was developed, in which the fluorine content was only about 10.3% of that used in the conventional TFA-MOD method. Attenuated total reflectance-Fourier transformed-infrared spectra(ATR-FT-IR) revealed that BaCO3 was remarkably suppressed in the as-pyrolyzed film and eliminated at 700 • C. Thus YBCO films with a critical current density (Jc) over 5 MA cm −2 (77 K, 0 T, 200 nm thickness) could be obtained on LAO single crystal substrates. In-situ FT-IR spectra showed that no obvious fluorinated gaseous by-products were detected in the pyrolysis step, which indicated that all of the F atoms might remain in the film as fluorides. X-ray diffraction (XRD) θ/2θ scan showed that BaF2, but neither YF3 nor CuF2, was detected in the films quenched at 400 -800 • C. The formation priority of BaF2 over YF3 and CuF2 was interpreted by the chemical equilibrium of the potential reactions. Our study could enlarge the synthesis window of the precursor solution for MOD-YBCO fabrication and open a gate to study the fluorine content in the precursor solution continuously and systematically.

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“…It has been shown by Mosiadz el al. [27], who recently studied the thermal decomposition of yttrium trifluoroacetate under different atmospheres (Ar or air), that the trifluoroacetate species decompose on heating at ~275ºC, resulting in yttrium fluoride (YF 3 ). These authors also reported that the presence of water induces the hydrolysis of YF 3 to yttrium oxyfluorides (YOF and/or Y 7 O 6 F 9 ) when the heating temperature was raised above 600ºC [27].…”

Section: Introductionmentioning

confidence: 99%

“…[27], who recently studied the thermal decomposition of yttrium trifluoroacetate under different atmospheres (Ar or air), that the trifluoroacetate species decompose on heating at ~275ºC, resulting in yttrium fluoride (YF 3 ). These authors also reported that the presence of water induces the hydrolysis of YF 3 to yttrium oxyfluorides (YOF and/or Y 7 O 6 F 9 ) when the heating temperature was raised above 600ºC [27]. The use of this fluoride source is essential to avoid instantaneous precipitation of rare earth fluoride (REF 3 ) in the starting solutions, which would be produced when using other inorganic fluoride salts.…”

Section: Introductionmentioning

confidence: 99%

Template-free synthesis and luminescent properties of hollow Ln:YOF (Ln = Eu or Er + Yb) microspheres

Martínez‐Castro

García‐Sevillano

Cussó

et al. 2015

Journal of Alloys and Compounds

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A method for the synthesis of hollow lanthanide doped yttrium oxyfluoride (YOF) spheres in the micrometer size range with cubic structure based on the pyrolysis at 600ºC of liquid aerosols generated from aqueous solutions containing the corresponding rare earth chlorides and trifluoroacetic acid has been developed. This procedure, which has been used for the first time for the synthesis of YFO based materials, is simpler and advantageous when compared with other methods usually employed for the production of hollow spheres since it does not require the use of sacrificial templates. In addition, it is continuous, which is desirable because of practical reasons. The procedure is also suitable for doping the YOF spheres with europium cations resulting in down converting red phosphors when activated with UV light, or for co-doping with both Er

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An in-depth in situ IR study of the thermal decomposition of yttrium trifluoroacetate hydrate

Cited by 32 publications

References 44 publications

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Template-free synthesis and luminescent properties of hollow Ln:YOF (Ln = Eu or Er + Yb) microspheres

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An in-depth in situ IR study of the thermal decomposition of yttrium trifluoroacetate hydrate

Cited by 32 publications

References 44 publications

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF3:Eu3+ nanocrystals

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF3:Eu3+ nanocrystals

A low-fluorine solution with a 2:1 F/Ba mole ratio for the fabrication of YBCO films

Template-free synthesis and luminescent properties of hollow Ln:YOF (Ln = Eu or Er + Yb) microspheres

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Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals