Abstract
In this work, the conductivity of and oxygen ion diffusion in Na0.5Bi0.5−xKxTiO3−x (x = 0.02, 0.04 and 0.06) were studied. Results demonstrated that as K content is increased, the bulk conductivity of Na0.5Bi0.5−xKxTiO3−x compounds increased gradually until reach maximum of 1.18 × 10−3 S/cm for Na0.50Bi0.46K0.04TiO2.96 at 673 K and then decreased whereas the activation energy decreased monotonically, owing to the fact that the higher the K content, the lower the lower mobile oxygen vacancy content in Na0.5Bi0.5−xKxTiO3−x as deduced from the height of the relaxation peak. Moreover, the crystal structure has vital influence on the oxygen ion relaxation activation energy of Na0.5Bi0.5−xKxTiO3−x compounds, with 0.87–0.90 eV in the rhombohedra and 0.62–0.71 eV in the tetrahedral. The results are meaningful to understand the relationship between the electrical properties and structure and helpful to enhance the oxide ion conductivity of the Na0.5Bi0.5TiO3-based oxygen ion conductors.
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