Ebert, Julian N. ; Jennings, Dylan ; Scheld, Walter Sebastian ; Sebold, Doris ; Rheinheimer, Wolfgang (2024)
Influence of Ba non-stoichiometry on the processing properties of Y- and Sc-doped BaZrO3.
In: Journal of the European Ceramic Society, 44 (12)
doi: 10.1016/j.jeurceramsoc.2024.04.070
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Y-doped BaZrO3 is a well-researched material for proton-conducting fuel cells. One of the main limitations is the very high sintering temperature (∼ 1600 °C) necessary to densify the material. As Ba is lost at this temperature due to BaO evaporation, the stoichiometry is changed uncontrollably. This study is focused on evaluating the influence of slight changes in stoichiometry on microstructure, chemical stability, and conductivity of 20% Y-doped BaZrO3 (BZY20) as well as 10% Y- and 10% Sc-co-doped BaZrO3 (BZY10Sc10). Overall, Ba excess resulted denser microstructures with larger grains. Still, these samples were prone to decomposition by forming BaCO3. Therefore, a slight Ba deficiency is favorable as the conductivity did not suffer in the examined stoichiometry region.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Ebert, Julian N. ; Jennings, Dylan ; Scheld, Walter Sebastian ; Sebold, Doris ; Rheinheimer, Wolfgang |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of Ba non-stoichiometry on the processing properties of Y- and Sc-doped BaZrO3 |
| Sprache: | Englisch |
| Publikationsjahr: | 2024 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 44 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1016/j.jeurceramsoc.2024.04.070 |
| Kurzbeschreibung (Abstract): | Y-doped BaZrO3 is a well-researched material for proton-conducting fuel cells. One of the main limitations is the very high sintering temperature (∼ 1600 °C) necessary to densify the material. As Ba is lost at this temperature due to BaO evaporation, the stoichiometry is changed uncontrollably. This study is focused on evaluating the influence of slight changes in stoichiometry on microstructure, chemical stability, and conductivity of 20% Y-doped BaZrO3 (BZY20) as well as 10% Y- and 10% Sc-co-doped BaZrO3 (BZY10Sc10). Overall, Ba excess resulted denser microstructures with larger grains. Still, these samples were prone to decomposition by forming BaCO3. Therefore, a slight Ba deficiency is favorable as the conductivity did not suffer in the examined stoichiometry region. |
| Freie Schlagworte: | acceptor-doped BaZrO3, stoichiometry, microstructure evolution, chemical stability, conductivity |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1548: FLAIR – Fermi Level Engineering Applied to Oxide Electroceramics |
| Hinterlegungsdatum: | 14 Aug 2024 05:19 |
| Letzte Änderung: | 14 Aug 2024 05:19 |
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