Oxide ion conduction and transporting mechanism in the layered perovskite-related material Sr2Nb2O7. (December 2022)

• Record Type: Journal Article
• Authors: Guo, Yaqiong; Guo, Wenbin; Lei, Libin; Xu, Jungu
• Is Part Of: Scripta materialia. Number 221(2022)
• Publication Date: 2022-12
• Subjects: Sr2Nb2O7 -- Perovskite -- X-ray diffraction -- Fast-ion conductor -- Simulation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114962
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Ionic conduction has been well-documented in three typical layered perovskite materials, namely Ruddlesden-Popper-type, Dion-Jacobson-type, and Aurivillius-type. In the present work, the oxide ion conduction was reported in the Sr2 Nb2 O7 material which also adopts a layered perovskite-related structure but does not fall into any of the above-mentioned three typical structures. The results revealed that the oxide ion conduction originated from the slight reduction of Nb 5+ ions during the high-temperature synthesis process, as the sample prepared under a pure oxygen atmosphere showed more than one order of magnitude lower conductivity than the sample prepared under an ambient atmosphere. The bond-valence-based method was applied to investigate the oxide ion migration mechanism, and revealed a two-dimensional pathway within the perovskite slabs. The discovery of this new oxide ion conductor will stimulate extensive exploitation and fundamental research on other layered perovskite-related materials. Graphical Abstract: Graphical Abstract. Image, graphical abstract .