DUTTA, Rajesh; MAITY, Avishek; MARSICANO, Anna; CERETTI, Monica; CHERNYSHOV, Dmitry; BOSAK, Alexei; VILLESUZANNE, Antoine; ROTH, Georg; PERVERSI, Giuditta; PAULUS, Werner

doi:10.1039/D0TA04652C

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DUTTA, Rajesh
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]

MAITY, Avishek
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]

MARSICANO, Anna
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]

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Ce document a été publié dans

Journal of Materials Chemistry A. 2020, vol. 8, n° 28, p. 13987-13995

Royal Society of Chemistry

Résumé en anglais

Solid oxide ion conductors are technologically important for oxygen membranes, sensors and solid oxide fuel cells (SOFC). However, oxygen diffusion is a thermally activated process, and materials operating at ambient temperature are rare, as the related diffusion mechanisms are poorly understood. Herein, we report a hidden spontaneous oxygen release reaction that interconverts two stoichiometric phases of the SOFC material Pr2NiO4+δ with unprecedented structural complexity at ambient temperature. A slight change in the oxygen stoichiometry from δ = 0.25 to δ = 0.225 involves a transition between two competing modulated superstructures, showing long-range translational periodicities up to 94 Å. Our findings demonstrate correlated oxygen diffusion within the bulk phase at room temperature, which is accompanied by the formation of long-range modulated superstructures up to the lower mesoscale. Large-scale ordered structures found here for Pr2NiO4+δ are rather indicative of non-local interactions, and are interpreted to be mediated via structural deformations. This unexpected behavior is discussed in terms of an unconventional understanding of low-T oxygen diffusion mechanisms and its potential to conceive and optimize oxygen ion conductors, which are an important class of compounds relevant to technological applications.< Réduire

DOI

http://dx.doi.org/10.1039/D0TA04652C

Project ANR

Mécanismes assistés pour la conduction par ion oxygène dans des oxydes non stœchiométriques
Structural induced Electronic Complexity controlled by low temperature Topotactic Reaction

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Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026