This title appears in the Scientific Report :
2021
Y and Mn substituted BaZrO3 ceramics: material properties as a function of the substituents concentration
Y and Mn substituted BaZrO3 ceramics: material properties as a function of the substituents concentration
Innovations in material science are the key element for solving technological challenges. Various energy and environmental applications require designing materials with tailored compositions, microstructures and specific target-oriented performance. Y and Mn co-substituted BaZrO3, e.g. BaZr0.85Y0.15...
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Personal Name(s): | Ivanova, Mariya (Corresponding author) |
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Balaguer, Maria / Jalarvo, Niina / Fantin, Andrea / Menzler, Norbert H. / Guillon, Olivier | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Imprint: |
2021
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Conference: | Solid State Proton Conductors 2020, online (Germany), 2021-09-27 - 2021-10-01 |
Document Type: |
Conference Presentation |
Research Program: |
Verbundvorhaben ProtOMem: Entwicklung von protonenleitenden Membranen mit optimierter Mikrostruktur und verbesserten Transporteigenschaften für Energie- und Wasserstoffseparationsanwendungen Cell Design and Development |
Subject (ZB): | |
Publikationsportal JuSER |
Innovations in material science are the key element for solving technological challenges. Various energy and environmental applications require designing materials with tailored compositions, microstructures and specific target-oriented performance. Y and Mn co-substituted BaZrO3, e.g. BaZr0.85Y0.15Mn0.05O3-δ (BZYM5), has previously attracted attention as a membrane material for H2 separation from gas mixture due to its mixed proton-electron conductivity leading to appreciable levels of H2-flux at elevated temperatures and its good thermo-chemical stability under reducing environments. In the present work, we developed ceramic materials within the BaZr0.8Y0.2-xMnxO3-δ series, where x =0.02, 0.05, 0.10, and systematically studied their functional properties in dependence of the Y-to-Mn ratio, including thermal behaviour, hydration and electrical properties. In addition to that, near edge X-ray absorption fine structure spectra (NEXAFS) in the vicinity of O K-edge and Mn L2,3-edges was carried out for selected BZYM specimens to collect information on oxidation states and surrounding symmetry of Mn atoms in surface- and bulk- sensitive modes. Finally, we studied proton diffusion in hydrated BZYM samples using quasi-elastic neutron scattering (QENS). Two distinct dynamic processes were observed at temperatures above 300 °C: one faster more localized process and another slower long-range diffusion process. The long-range diffusion has clear characteristics of jump-diffusion. We will present a model for atomic scale proton diffusion in these materials, and we will further discuss how Mn doping influences the proton diffusion in these materials. |