Journal
RESULTS IN PHYSICS
Volume 11, Issue -, Pages 422-426Publisher
ELSEVIER
DOI: 10.1016/j.rinp.2018.09.028
Keywords
Oxide ionic conductivity; Dielectric relaxation; Oxygen vacancy mobility; Dual substitution
Funding
- National Natural Science Foundation of China [11604286, 51661032]
- Special project of Yan'an university institute of material physics research and High-level University Construction Special Program of Shaanxi Province [Physics-2012SXTS05]
- Yan'an University National Natural Science Foundation [YD2015-07, YDBK2014-01]
- Shanxi Provincial College students' innovative projects [D2017143, D2017163]
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The Na and Al dual substitution Na0.5Bi0.5TiO3 samples were synthesized by the conventional solid-state reaction method. The oxygen ion conductivity and migration in the Na0.54Bi0.46Ti1-xAlxO2.96-x/2 (x= 0.02, 0.04, 0.06 and 0.08) samples were investigated. The grain conductivity and relaxation activation energy of the Na0.54Bi0.46Ti1-xAlxO2.96-x/2 samples show the trend of declining-rising-declining with the increase of Al-doped content. The highest grain conductivity can arrive at 0.0016 S/cm for the Na0.54Bi0.46Ti1-xAlxO2.96-x/2 (x= 0.06) sample at 673 K and the corresponding activation energy is about 0.80 eV, which are the lowest results of oxygen ion diffusion in the Na0.54Bi0.46Ti1-xAlxO2.96-x/2 (x= 0.02, 0.04, 0.06 and 0.08) samples. The mobile oxygen vacancy content decreases with increasing Al-doping content in the Na0.54Bi0.46Ti1-xAlxO2.96-x/2 compounds. The sudden change of grain conductivity in NBT-Na4Al6 sample may be from the lower activation energy and better oxygen vacancy mobility. These results are helpful to improve the electrical performance by doping methods.
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