Abstract:
:Oxide-ion conductors have found applications in various electrochemical devices, such as solid-oxide fuel cells, gas sensors, and separation membranes. Dion-Jacobson phases are known for their rich magnetic and electrical properties; however, there have been no reports on oxide-ion conduction in this family of materials. Here, for the first time to the best of our knowledge, we show the observation of fast oxygen anionic conducting behavior in CsBi2Ti2NbO10-δ. The bulk ionic conductivity of this Dion-Jacobson phase is 8.9 × 10-2 S cm-1 at 1073 K, a level that is higher than that of the conventional yttria-stabilized zirconia. The oxygen ion transport is attributable to the large anisotropic thermal motions of oxygen atoms, the presence of oxygen vacancies, and the formation of oxide-ion conducting layers in the crystal structure. The present finding of high oxide-ion conductivity in rare-earth-free CsBi2Ti2NbO10-δ suggests the potential of Dion-Jacobson phases as a platform to identify superior oxide-ion conductors.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang W,Fujii K,Niwa E,Hagihala M,Kamiyama T,Yashima Mdoi
10.1038/s41467-020-15043-zsubject
Has Abstractpub_date
2020-03-06 00:00:00pages
1224issue
1issn
2041-1723pii
10.1038/s41467-020-15043-zjournal_volume
11pub_type
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