Professor Ivana Evans ivana.radosavljevic@durham.ac.uk
Professor
The crystal structure of alpha-La2Mo2O9 and the structural origin of the oxide ion migration pathway
Evans, I.R.; Howard, J.A.K.; Evans, J.S.O.
Authors
J.A.K. Howard
Professor John Evans john.evans@durham.ac.uk
Professor
Abstract
We describe for the first time the full 3D atomic structure of room-temperature alpha-La2Mo2O9. The material, despite its simple chemical formula, has a remarkable 312 crystallographically unique atoms and is thus one of the most complex oxide structures reported to date. Despite this complexity, the structural results offer significant insight into the O2- migration pathway in the anion conducting high-temperature form, beta-La2Mo2O9. The material contains a mixture of 4, 5, and 6 coordinated Mo sites, suggesting that variable Mo coordination number is a key factor in providing a low-energy O2- conduction pathway. We provide quantitative analysis showing that the positions in the ordered array of 216 oxygen sites of alpha-La2Mo2O9 are directly related to the average sites occupied in beta-La2Mo2O9, providing compelling evidence that the high-temperature conducting form of the material has a time-averaged version of the low-temperature structure.
Citation
Evans, I., Howard, J., & Evans, J. (2005). The crystal structure of alpha-La2Mo2O9 and the structural origin of the oxide ion migration pathway. Chemistry of Materials, 17(16), 4074-4077. https://doi.org/10.1021/cm050049%2B
Journal Article Type | Article |
---|---|
Publication Date | Aug 1, 2005 |
Deposit Date | May 10, 2007 |
Journal | Chemistry of Materials |
Print ISSN | 0897-4756 |
Electronic ISSN | 1520-5002 |
Publisher | American Chemical Society |
Peer Reviewed | Peer Reviewed |
Volume | 17 |
Issue | 16 |
Pages | 4074-4077 |
DOI | https://doi.org/10.1021/cm050049%2B |
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