TY  - CONF
AU  - Ivanova, Mariya
AU  - Balaguer, Maria
AU  - Jalarvo, Niina
AU  - Fantin, Andrea
AU  - Menzler, Norbert H.
AU  - Guillon, Olivier
TI  - Y and Mn substituted BaZrO3 ceramics: material properties as a function of the substituents concentration
M1  - FZJ-2021-04007
PY  - 2021
N1  - Key words: mixed proton-electronic ceramic conductors, proton conducting ceramic cells, ceramic membranes for H2 separation, B-side double substituted BaZrO3, A(II)B(IV)O3 perovskites, BaZr0.8Y0.2-xMnxO3-δ, NEXAFS, QENS
AB  - 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.
T2  - Solid State Proton Conductors 2020
CY  - 27 Sep 2021 - 1 Oct 2021, online (Germany)
Y2  - 27 Sep 2021 - 1 Oct 2021
M2  - online, Germany
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/902059
ER  -