Optimum temperature range for the proton dynamics in H-doped BaZrO₃:Yb dense ceramics—a neutron scattering study

Abstract

Abstract

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

“…The protonation process leads to subtle modifications of a material structure whatever the small amount of incorporated protons [28][29][30][31][32][33][34][35]. The quantity of CO 2 dissolved in the water used is one of the stringent parameters.…”

Aqua oxyhydroxycarbonate second phases at the surface of Ba/Sr‐based proton conducting perovskites: a source of confusion in the understanding of proton conduction

“…Although the events related to carbonation (~900 °C) and de‐hydroxylation (~400 °C) are clearly visible for porous ceramics (Fig. b), they are absent in the case of high dense ceramic, the proton loss being observed at higher temperature (700 °C) according to different proton nature . Recent neutronography measurement confirmed the presence of a thin hydrogen‐rich film at the surface of porous ceramic.…”

“…1b), they are absent in the case of high dense ceramic, the proton loss being observed at higher temperature (700 C) according to different proton nature. [64,65] Recent neutronography measurement [12] confirmed the presence of a thin hydrogen-rich film at the surface of porous ceramic. On the contrary, in the case of high dense ceramic, the neutronography results reveal a proton distribution throughout the ceramic.…”

Structural stability of anhydrous proton conducting SrZr0.9Er0.1O3−δ perovskite ceramic vs. protonation/deprotonation cycling: Neutron diffraction and Raman studies

“…Apart from some works performed at low temperature and then not pertinent to understand the proton conduction mechanisms (review in [34]), we can highlight those of Malikova et al [36] and the group of Irvine [37] dealing with structural modifications in an operating temperature range. For these reasons we have conducted series of neutron diffraction and quasi-elastic neutron scattering campaigns to address these points better [34,[38][39][40][41].…”

“…This study was undertaken in order to go further in our general goal, i.e. the characterisation of eventual structural modifications caused by conducting protons during the protonation/deprotonation cycles [25][26][27][28][29][30][38][39][40][41]. Moreover, the results allowed to complete our previous ones performed on high density SrZr0.9Yb0.1O3-δ ceramics [41].…”