Oxide-ion conduction in the Dion-Jacobson phase CsBi<sub>2</sub>Ti<sub>2</sub>NbO<sub>10-δ</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 32144260.
- Also identified by DOI 10.1038/s41467-020-15043-z and PMC identifier 7060205.
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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 CsBi<sub>2</sub>Ti<sub>2</sub>NbO<sub>10-δ</sub>. The bulk ionic conductivity of this Dion-Jacobson phase is 8.9 × 10<sup>-2</sup> S cm<sup>-1</sup> 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 CsBi<sub>2</sub>Ti<sub>2</sub>NbO<sub>10-δ</sub> suggests the potential of Dion-Jacobson phases as a platform to identify superior oxide-ion conductors.