المؤلفون: Nader, Christina, Lammer, Judith, Egger, Andreas, Berger, Christian, Sitte, Werner, Grogger, Werner, Merkle, Rotraut, Maier, Joachim, Bucher, Edith

المساهمون: FFG

المصدر: Solid State Ionics ; volume 406, page 116474 ; ISSN 0167-2738

مصطلحات موضوعية: Condensed Matter Physics, General Materials Science, General Chemistry

الإتاحة: https://doi.org/10.1016/j.ssi.2024.116474Test
https://api.elsevier.com/content/article/PII:S0167273824000225?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S0167273824000225?httpAccept=text/plainTest

المؤلفون: Sitte, Werner, Merkle, Rotraut

مصطلحات موضوعية: ddc:620, Engineering & allied operations, info:eu-repo/classification/ddc/620

العلاقة: info:eu-repo/semantics/altIdentifier/isbn/978-0-7503-3949-0; https://publikationen.bibliothek.kit.edu/1000157652Test

الإتاحة: https://doi.org/10.1088/978-0-7503-3951-3Test
https://publikationen.bibliothek.kit.edu/1000157652Test

المؤلفون: Egger, Andreas, Eisbacher‐Lubensky, Sarah, Sampl, Kathrin, Subotić, Vanja, Hochenauer, Christoph, Sitte, Werner, Bucher, Edith

المصدر: Fuel Cells ; volume 23, issue 6, page 387-398 ; ISSN 1615-6846 1615-6854

الوصف: In this work, fundamental material properties of compounds in the system (La,Pr) 2 (Ni,Co)O 4+δ as well as their performance as air electrodes in solid oxide electrolysis cells were investigated. Nickelates co‐doped with Pr and Co were characterized on a material basis by means of X‐ray diffraction and thermogravimetry. Conductivity and conductivity relaxation measurements were performed in order to obtain the electronic conductivity as well as the chemical surface exchange coefficient and the chemical diffusion coefficient of oxygen as a function of temperature and oxygen partial pressure. These parameters can be regarded as the most essential properties at the material level required to assess the suitability of mixed ionic‐electronic conducting ceramics for application as air electrode in solid oxide cells. The electrode performance of the materials was then tested on fuel electrode‐supported button cells at 800°C. The electrodes were applied by screen‐printing and the effect of varying the Pr‐content and Co‐content of the electrode powder was investigated. Cell tests were performed by means of current‐voltage measurements in electrolysis mode. While no significant impact of Pr‐doping on the investigated material properties was observed, the electrode performance of Pr‐containing materials was significantly better than for the Pr‐free compound, which has been discussed in detail.

الإتاحة: https://doi.org/10.1002/fuce.202300037Test

المؤلفون: Eisbacher-Lubensky, Sarah, Egger, Andreas, Sitte, Werner, Bucher, Edith

المصدر: Solid State Ionics ; volume 397, page 116255 ; ISSN 0167-2738

مصطلحات موضوعية: Condensed Matter Physics, General Materials Science, General Chemistry

الإتاحة: https://doi.org/10.1016/j.ssi.2023.116255Test
https://api.elsevier.com/content/article/PII:S0167273823001133?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S0167273823001133?httpAccept=text/plainTest

المؤلفون: Berger, Christian, Bucher, Edith, Merkle, Rotraut, Nader, Christina, Lammer, Judith, Grogger, Werner, Maier, Joachim, Sitte, Werner

المساهمون: Österreichische Forschungsförderungsgesellschaft

المصدر: Journal of Materials Chemistry A ; volume 10, issue 5, page 2474-2482 ; ISSN 2050-7488 2050-7496

الوصف: Substitution with Y affects phase formation and the local cation stoichiometry of the Ce-rich and Fe-rich phases of BaCe 1−( x + z ) Fe x Y z O 3− δ self-generated composites. This is of particular importance for the water uptake in these compounds.

الإتاحة: https://doi.org/10.1039/d1ta07208kTest
http://pubs.rsc.org/en/content/articlepdf/2022/TA/D1TA07208KTest

المؤلفون: Berger, Christian, Bucher, Edith, Merkle, Rotraut, Nader, Christina, Lammer, Judith, Grogger, Werner, Maier, Joachim, Sitte, Werner

المساهمون: Österreichische Forschungsförderungsgesellschaft

المصدر: Journal of Materials Chemistry A ; volume 10, issue 32, page 17009-17009 ; ISSN 2050-7488 2050-7496

الوصف: Correction for ‘Influence of Y-substitution on phase composition and proton uptake of self-generated Ba(Ce,Fe)O 3− δ –Ba(Fe,Ce)O 3− δ composites’ by Christian Berger et al. , J. Mater. Chem. A , 2022, 10 , 2474–2482, https://doi.org/10.1039/D1TA07208KTest.

الإتاحة: https://doi.org/10.1039/d2ta90162eTest
http://pubs.rsc.org/en/content/articlepdf/2022/TA/D2TA90162ETest

المؤلفون: Lammer, Judith, Berger, Christian, Löffler, Stefan, Knez, Daniel, Longo, Paolo, Kothleitner, Gerald, Hofer, Ferdinand, Haberfehlner, Georg, Bucher, Edith, Sitte, Werner, Grogger, Werner

المساهمون: Klima-und Energiefonds, Horizon 2020, Austrian Science Fund, Austrian Research Promotion Agency

المصدر: Ultramicroscopy ; volume 234, page 113477 ; ISSN 0304-3991

مصطلحات موضوعية: Instrumentation, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

الإتاحة: https://doi.org/10.1016/j.ultramic.2022.113477Test
https://api.elsevier.com/content/article/PII:S0304399122000146?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S0304399122000146?httpAccept=text/plainTest

المؤلفون: Berger, Christian, Bucher, Edith, Lammer, Judith, Nader, Christina, Sitte, Werner

المساهمون: Österreichische Forschungsförderungsgesellschaft, Montanuniversität Leoben

المصدر: Journal of Materials Science ; volume 56, issue 17, page 10191-10203 ; ISSN 0022-2461 1573-4803

مصطلحات موضوعية: Mechanical Engineering, Mechanics of Materials, General Materials Science

الوصف: Compounds from the series La 0.8-x Nd x Ca 0.2 FeO 3-δ (0.1 ≤ x ≤ 0.7) were synthesised by a sol–gel route. X-ray diffraction and Rietveld analysis showed that materials with 0 ≤ x ≤ 0.6 crystallize as single-phase orthorhombic perovskites. The smaller ionic radius of Nd 3+ compared to La 3+ leads to a decrease in unit cell volume with increasing x. Elemental mapping by high-resolution scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy confirms the homogeneous distribution of the A-site elements (La, Nd and Ca) in the perovskite (ABO 3 ) lattice. The thermal expansion behaviour of La 0.8-x Nd x Ca 0.2 FeO 3-δ (0 ≤ x ≤ 0.6) was characterized by dilatometry at 30 ≤ T/°C ≤ 1000 and 1 × 10 –3 ≤ pO 2 /bar ≤ 1. The thermal expansion coefficients of La 0.8-x Nd x Ca 0.2 FeO 3-δ , which were determined in regions I (40–530 °C) and II (530–990 °C), respectively, are almost independent of the Nd concentration in the range of (0 ≤ x ≤ 0.6) and increase slightly with decreasing pO 2 . The transition from orthorhombic to trigonal modification, which is observed for La 0.8 Ca 0.2 FeO 3-δ at approx. 740 °C, is suppressed for all Nd-substituted compounds with x ≥ 0.1.

الإتاحة: https://doi.org/10.1007/s10853-021-05851-zTest

المؤلفون: Berger, Christian, Bucher, Edith, Merkle, Rotraut, Maier, Joachim, Sitte, Werner

المساهمون: Österreichische Forschungsförderungsgesellschaft

المصدر: Open Ceramics ; volume 6, page 100094 ; ISSN 2666-5395

مصطلحات موضوعية: Materials Chemistry, Biomaterials, Ceramics and Composites, Electronic, Optical and Magnetic Materials

الإتاحة: https://doi.org/10.1016/j.oceram.2021.100094Test
https://api.elsevier.com/content/article/PII:S2666539521000407?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S2666539521000407?httpAccept=text/plainTest

المؤلفون: Micu-Budisteanu, Bucher, Edith, Sitte, Werner, Berger, Christian, Lenser, Christian, Menzler, Norbert H.

المصدر: KERAMIK 2021- 96. Jahrestagung der Deutschen Keramischen Gesellschaft, Online, German, 2021-04-19 - 2021-04-21

جغرافية الموضوع: DE

الوصف: Preparation and characterization of La0.8Ca0.2Fe0.8Co0.2O3-δ as a new air electrode material for solid oxide cellsMario Micu-Budisteanu1, Christian Berger2, Edith Bucher1, Christian Lenser3, Norbert H. Menzler3, Werner Sitte11 Chair of Physical Chemistry, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria2 Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany3 Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research – Materials Synthesis and Processing (IEK-1), 52425 Jülich, GermanyPerovskites from the series (La,Sr)(Co,Fe)O3-δ are mixed ionic and electronic conductors that are suitable for a broad variety of possible applications, with cathodes for solid oxide fuel cells (SOFCs), anodes for solid oxide electrolyser cells (SOECs), electrochemical gas sensors and catalysts being the most promising fields of application. However, due to long-term stability issues, current research efforts are directed towards development of alternative Sr-free materials. Recently, high electronic- and good ionic conductivities, as well as exceptionally fast oxygen exchange kinetics were demonstrated for La0.8Ca0.2FeO3-δ (LCF82). In the present work, substitution of this material with cobalt is investigated with the aim to further improve sintering activity and electronic conductivity. Therefore, La0.8Ca0.2Fe0.8Co0.2O3-δ (LCFC8282) was synthesized using a sol-gel method. XRD confirmed that the material is single phase. Thermal expansion coefficients (TEC) were determined as a function of oxygen partial pressure (1×10-3 ≤ pO2/bar ≤ 1) and temperature (600 ≤ T/°C ≤ 1000). In comparison of LCF82 with LCFC8282, the TEC of the Co-substituted material is slightly higher with values of 19-23×10- 6 K-1. The electronic conductivity of LCFC8282 is in the range of 128 ≤ S cm-1 ≤ 145 at 600 ≤ T/°C ≤ 800 and pO2=0.1 bar and thus higher than that of LCF82 (~110 S cm-1). First results on the oxygen exchange kinetics of LCF8282 show high activity towards oxygen reduction.

العلاقة: https://juser.fz-juelich.de/record/905441Test; https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-00682%22Test

الإتاحة: https://juser.fz-juelich.de/record/905441Test
https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-00682%22Test