The thermochemical properties of BaCeO3(s) and SrCeO3(s) fromT=(5 to 1500) K

Cordfunke, E.H.P.; Booij, A.S.; Huntelaar, M.E.

doi:10.1006/jcht.1997.0302

Cited by 58 publications

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“…Despite the encouraging proton conductivity of these materials, there are several issues addressed related to their chemical stability, mechanical properties and difficulties in sintering of BZY. 15,17 BCY has a low chemical stability due to the reactivity with CO2 18 resulting in formation of barium carbonate, [19][20][21][22][23][24][25] while BZY is proposed to exhibit sufficient chemical stability in CO2-containing atmosphere. 12,[24][25][26][27][28][29] The reactivity with CO2 will result in degradation, which precludes applications in electrochemical devices such as fuel cells based on hydrocarbon fuels.…”

Section: -7mentioning

confidence: 99%

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

et al. 2016

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The reactivity of BaZrO3 with CO2 has been addressed as one of the major challenges with BaZrO3-based electrolytes in proton ceramic fuel cells. Here, we present a study of the effect of CO2 exposure of BaZrO3-materials at elevated temperatures. Dense BaZr1-xYxO3-δ (x = 0, 0.05, 0.1, 0.2) and BaCe0.2Zr0.7Y0.1O2.95 ceramics were prepared by conventional sintering of powder prepared by spray pyrolysis. The Vickers indentation method was used to determine the hardness and estimate the fracture toughness of pristine materials as well as the corresponding materials exposed to CO2. Formation of BaCO3 on the surface of exposed ceramics was confirmed by X-ray diffraction and electron microcopy. The reaction resulted in formation of Ba-deficient perovskite at the exposed surface. The reaction with CO2 was most pronounced at 650 ºC compared to the other temperatures applied in the study. The reactivity was also shown to depend on the Y-content and the grain size and was most pronounced for BaZr0.9Y0.1O3-δ. The reaction with CO2 was observed to have a profound effect on the fracture toughness of the ceramics, demonstrating a depression of the mechanical stability of the materials. The results are discussed with respect to the chemical and mechanical stability of BaZrO3 materials, with particular emphasis on the composition and grain size.

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Section: -7mentioning

confidence: 99%

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

et al. 2016

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“…The thermodynamic data suggest that barium cerate is an unstable phase in the wide temperature range [11][12][13]. The ΔG of the reaction of barium carbonate formation (Eq.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Łącz

2016

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Y-doped barium cerate BaCe 0.9 Y 0.1 O 3 − δ was synthesised by a solid-state reaction method. Materials with different average grain sizes and grain boundary surface areas were obtained. The effect of microstructure on the chemical stability in the CO 2 and H 2 O-containing atmosphere and electrical properties was analysed and discussed. To evaluate the chemical stability of BaCe 0.9 Y 0.1 O 3 − δ , the exposure test was performed. Samples were exposed to the carbon dioxide and water vapour-rich atmosphere at 25°C for 700 h. Thermogravimetry supplied by mass spectrometry was applied to analyse the samples before and after this comprehensive test. The mass loss for samples before and after the test and the amount of BaCO 3 formed during the test were directly treated as the measure of chemical instability of BaCe 0.9 Y 0.1 O 3 − δ in the atmosphere rich in carbon dioxide and water vapour. As it was observed, the BaCe 0.9 Y 0.1 O 3 − δ chemical stability towards CO 2 and H 2 O is not affected by the materials' microstructure. Electrical properties of BaCe 0.9 Y 0.1 O 3 − δ which differs with microstructure were determined using electrochemical impedance spectroscopy (EIS). It was found that the grain interior resistivity and activation energy of grain interior conductivity is microstructure independent. However, the effect on microstructure was seen on the EIS spectra in the range of grain boundary contribution. Therefore, the lowest activation energy and the highest conductivity were observed for a material with the lowest grain boundary surface area.

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“…measurements and mass spectrometric Knudsen cell measurements. [6][7][8][9] In our paper we used solution calorimetry as an investigation method. HCl (1 ) along with KI (0.1 ) was chosen as the solvent.…”

Section: Resultsmentioning

confidence: 99%

“…The molar concentration of metal chlorides was the same as in the literature. [6] A mixture of BaCl 2 , CeCl 3 and NdCl 3 was prepared in a ratio of 1:0.8:0.2. In order to determine the formation enthalpy of barium cerate doped by lutetium oxide we chose a thermochemical cycle in which we dissolved BaCe 0.…”

Section: Bace 08 Nd 02 O 29mentioning

confidence: 99%

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Preparation, Stability and Thermodynamic Properties of Nd‐ and Lu‐Doped BaCeO₃ Proton‐Conducting Ceramics

et al. 2009

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The thermochemical properties of BaCeO3(s) and SrCeO3(s) fromT=(5 to 1500) K

Cited by 58 publications

References 0 publications

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Preparation, Stability and Thermodynamic Properties of Nd‐ and Lu‐Doped BaCeO₃ Proton‐Conducting Ceramics

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The thermochemical properties of BaCeO3(s) and SrCeO3(s) fromT=(5 to 1500) K

Cited by 58 publications

References 0 publications

Effect of CO2 Exposure on the Chemical Stability and Mechanical Properties of BaZrO3‐Ceramics

Effect of CO2 Exposure on the Chemical Stability and Mechanical Properties of BaZrO3‐Ceramics

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Preparation, Stability and Thermodynamic Properties of Nd‐ and Lu‐Doped BaCeO3 Proton‐Conducting Ceramics

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Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Preparation, Stability and Thermodynamic Properties of Nd‐ and Lu‐Doped BaCeO₃ Proton‐Conducting Ceramics