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Large-scale oxygen order phase transitions and fast ordering kinetics at moderate temperatures in Nd 2 NiO 4+ δ electrodes.
- Source :
-
Materials advances [Mater Adv] 2022 Dec 13; Vol. 4 (2), pp. 651-661. Date of Electronic Publication: 2022 Dec 13 (Print Publication: 2023). - Publication Year :
- 2022
-
Abstract
- Non-stoichiometric 214-nickelates with Ruddlesden-Popper (RP) type frameworks emerged as potential candidates for mixed electronic/ionic conductors in the intermediate temperature range. In this work we investigated structural aspects of the oxygen ion mobility diffusion mechanisms in non-stoichiometric Nd <subscript>2</subscript> NiO <subscript>4+ δ </subscript> nickelates by X-ray (laboratory and synchrotron) as well by neutron diffraction. Temperature dependent synchrotron powder diffraction revealed a phase diagram of unprecedented complexity, involving a series of highly organized, 3D modulated phases related to oxygen ordering below 800 K. All phase transitionsimply translational periodicities exceeding 100 Å, and are found to be of 1 <superscript>st</superscript> order, together with fast ordering kinetics. These surprising structural correlations, induced by the presence of interstitial oxygen atoms, suggest a collective phason-like oxygen diffusion mechanism together with dynamical contributions from the aperiodical lattice creating shallow diffusion pathways down to room temperature.<br />Competing Interests: There are no conflicts to declare.<br /> (This journal is © The Royal Society of Chemistry.)
Details
- Language :
- English
- ISSN :
- 2633-5409
- Volume :
- 4
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Materials advances
- Publication Type :
- Academic Journal
- Accession number :
- 36741973
- Full Text :
- https://doi.org/10.1039/d2ma00833e