High Temperature Infrared Properties of <scp>YSZ</scp> Electrolyte Ceramics for <scp>SOFCs</scp>: Experimental Determination and Theoretical Modeling

Dombrovsky, Leonid A.; Rousseau, Benoı̂t; Echegut, Patrick; Randrianalisoa, Jaona; Baillis, Dominique

doi:10.1111/j.1551-2916.2011.04655.x

Cited by 32 publications

(21 citation statements)

References 54 publications

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“…The experimental technique of this type is widely used in studies of semitransparent dispersed materials. Therefore, we do not reproduce here the experimental setup schematics, which can be found elsewhere [18][19][20][21]. The spectral measurements in the wavelength range of 0.67 ≤ λ ≤ 1.1 μm are analyzed in this paper.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

et al. 2014

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Polypropylene is considered as a representative thermoplastic matrix for advanced composite materials that have some advantages in various engineering applications. Wide-range infrared optical properties of polypropylene are important for combined heat transfer modeling in these composite materials, which are semitransparent in a considerable part of the whole spectral range. This study is focused on optical properties of polypropylene in the visible and near-infrared ranges because the measurements in these ranges exhibit a stronger effect of the processing temperature used in the material manufacturing. The experimental study is based on spectral measurements of both the normal-hemispherical reflectance and transmittance of polypropylene samples. The main characteristics of volumetric absorption and scattering are identified using the inverse problem solution based on the modified two-flux approximation, which is sufficiently accurate to determine the hemispherical characteristics of the radiation field in the range of the problem parameters. In particular, the effect of a relatively strong scattering is observed at the absorption peaks in the near-infrared range. An approximate theoretical model based on spectroscopic data is developed to estimate morphological changes arising in thermal processing of polypropylene at different temperatures.

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Section: Samples and Experimental Proceduresmentioning

confidence: 99%

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

et al. 2014

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“…5 Doping ZrO 2 with Y 2 O 3 stabilizes either the cubic or tetragonal phase (strongly depending on production technique) over a large temperature range and creates oxygen vacancies. 2,3 Thus, a lot of progress has been made especially regarding characterization of the surface chemistry of a variety of different ZrO 2 samples. Materialwise, this essentially refers to supported metal/oxide systems 6−9 and sulfated ZrO 2 samples.…”

Section: Introductionmentioning

confidence: 99%

In Situ FT-IR Spectroscopic Study of CO₂ and CO Adsorption on Y₂O₃, ZrO₂, and Yttria-Stabilized ZrO₂

et al. 2013

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In situ FT-IR spectroscopy was exploited to study the adsorption of CO2 and CO on commercially available yttria-stabilized ZrO2 (8 mol % Y, YSZ-8), Y2O3, and ZrO2. All three oxides were pretreated at high temperatures (1173 K) in air, which leads to effective dehydroxylation of pure ZrO2. Both Y2O3 and YSZ-8 show a much higher reactivity toward CO and CO2 adsorption than ZrO2 because of more facile rehydroxylation of Y-containing phases. Several different carbonate species have been observed following CO2 adsorption on Y2O3 and YSZ-8, which are much more strongly bound on the former, due to formation of higher-coordinated polydentate carbonate species upon annealing. As the crucial factor governing the formation of carbonates, the presence of reactive (basic) surface hydroxyl groups on Y-centers was identified. Therefore, chemisorption of CO2 most likely includes insertion of the CO2 molecule into a reactive surface hydroxyl group and the subsequent formation of a bicarbonate species. Formate formation following CO adsorption has been observed on all three oxides but is less pronounced on ZrO2 due to effective dehydroxylation of the surface during high-temperature treatment. The latter generally causes suppression of the surface reactivity of ZrO2 samples regarding reactions involving CO or CO2 as reaction intermediates.

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“…P OROUS zirconia ceramics have many advantages, such as low thermal conductivity, low density, corrosion resistance, and high-temperature resistance, 1,2 and so can be applied in many fields, namely ceramic filters, catalyst supports, solid oxide fuel cells, biological materials, and thermal barriers. [3][4][5][6][7] For thermal isolation use, research has been recently focused on zirconia thermal barrier coatings (TBC), [8][9][10][11] but few studies have reported the application of porous zirconia ceramics in bulk thermal isolators. 12,13 This is mainly because porous zirconia ceramics have a critical shortcoming, low strength, which seriously limits their application.…”

Section: Introductionmentioning

confidence: 99%

Porous yttria‐Stabilized Zirconia Ceramics Fabricated by Nonaqueous‐Based Gelcasting Process with PMMA Microsphere as Pore‐Forming Agent

Zhou

Wang

2012

J. Am. Ceram. Soc.

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Porous yttria‐stabilized zirconia (YSZ) ceramics were fabricated using tert‐butyl alcohol (TBA)‐based gelcasting with monodisperse polymethylmethacrylate (PMMA) microspheres as both pore‐forming agent and lubricant agent. The TBA‐based slurry of 50 vol% solid loading with excellent rheological properties appropriate for casting was successfully prepared by using a commercial polymer dispersant DISPERBYK‐163 as both dispersant and stabilizer. The distribution of the spherical pores made from PMMA microspheres was very homogeneous. Their average diameter decreased from 16.9 to 15.7 μm when the sintering temperature was increased from 1350°C to 1550°C. The compressive strength increased from 14.57 to 142.29 MPa and the thermal conductivity changed from 0.17 to 0.65 W/m·K when the porosity decreased from 71.6% to 45.1%. The results show that this preparation technology can make all the main factors controllable, such as the porosity, the size and shape of pores, the distribution of pores, and the thickness and density of pore walls. This is significant for fabricating porous ceramics with both high compressive strength and low thermal conductivity.

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High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

Cited by 32 publications

References 54 publications

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

In Situ FT-IR Spectroscopic Study of CO₂ and CO Adsorption on Y₂O₃, ZrO₂, and Yttria-Stabilized ZrO₂

Porous yttria‐Stabilized Zirconia Ceramics Fabricated by Nonaqueous‐Based Gelcasting Process with PMMA Microsphere as Pore‐Forming Agent

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High Temperature Infrared Properties of YSZ Electrolyte Ceramics for SOFCs: Experimental Determination and Theoretical Modeling

Cited by 32 publications

References 54 publications

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene

In Situ FT-IR Spectroscopic Study of CO2 and CO Adsorption on Y2O3, ZrO2, and Yttria-Stabilized ZrO2

Porous yttria‐Stabilized Zirconia Ceramics Fabricated by Nonaqueous‐Based Gelcasting Process with PMMA Microsphere as Pore‐Forming Agent

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In Situ FT-IR Spectroscopic Study of CO₂ and CO Adsorption on Y₂O₃, ZrO₂, and Yttria-Stabilized ZrO₂