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Tuning sodium and oxygen mixed-ion conduction in the A-site nonstoichiometric NaNbO3-based ceramics
Abstract: Associations of two mobile ionic species (positive and the other negative charges) in a specific matrix as solid-state electrolytes are of high interest in electrochemical energy storage and conversion devices. Here a strategy of A-site nonstoichiometric ratio was applied in NaNbO3-based ceramics. The crystal structure, microstructure, and electric properties of NaNbO 3-based ceramic (0.96NaxNbO 3-0.04CaZrO 3, x = 0.96 to 1.02 mol %) was investigated. The P21ma phase was maintained for all samples and the grain size increased from 5.72 pm to 8.93 pm with increasing the Na content. The conductance mode presented 3 different types with the various sodium contents: In the case of Na deficiency, the Na+ and 02- mixed-ion conductance was appeared. At lower temperature (400 °C-540 °C), Na+ was the main carrier. When the temperature up to 540 °C, the crystal structure transformed to tetragonal phase, and the main carrier changed from Na+ to 02- (Type I). The stoichiometric sample was an ionic conductor with Na+ as the main carrier (Type II). Moreover, the samples with excess Na were ionic conductivity materials with 02- as the main carrier (Type III). This work provides a new strategy to tune the mixed ionic conductivity of NaNbO 3-basedceramics.
Tuning sodium and oxygen mixed-ion conduction in the A-site nonstoichiometric NaNbO3-based ceramics
Abstract: Associations of two mobile ionic species (positive and the other negative charges) in a specific matrix as solid-state electrolytes are of high interest in electrochemical energy storage and conversion devices. Here a strategy of A-site nonstoichiometric ratio was applied in NaNbO3-based ceramics. The crystal structure, microstructure, and electric properties of NaNbO 3-based ceramic (0.96NaxNbO 3-0.04CaZrO 3, x = 0.96 to 1.02 mol %) was investigated. The P21ma phase was maintained for all samples and the grain size increased from 5.72 pm to 8.93 pm with increasing the Na content. The conductance mode presented 3 different types with the various sodium contents: In the case of Na deficiency, the Na+ and 02- mixed-ion conductance was appeared. At lower temperature (400 °C-540 °C), Na+ was the main carrier. When the temperature up to 540 °C, the crystal structure transformed to tetragonal phase, and the main carrier changed from Na+ to 02- (Type I). The stoichiometric sample was an ionic conductor with Na+ as the main carrier (Type II). Moreover, the samples with excess Na were ionic conductivity materials with 02- as the main carrier (Type III). This work provides a new strategy to tune the mixed ionic conductivity of NaNbO 3-basedceramics.
Tuning sodium and oxygen mixed-ion conduction in the A-site nonstoichiometric NaNbO3-based ceramics
LIU ZHIYONG (author) / XU SHUAICHANG (author) / DING YUWEI (author)
2021-08-19
Patent
Electronic Resource
English
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