Investigation of Sr, Mg codoped Na0.5Bi0.5TiO3 oxide ion conductor prepared by spark plasma sintering
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The spark plasma sintering and conventional sintering methods were used to prepare the Sr/Mg–codoped Na0.5Bi0.48Sr0.02Ti0.96Mg0.04O2.95 (NBT-SM) compounds. By the AC impedance spectrum test, the grain and total conductivity of NBT-SM sample sintered by the spark plasma sintering method (NBT-SM-SPS) at 673 K can reach 1.23 mS/cm and 0.478 mS/cm, respectively. The grain conductivity of NBT-SM-SPS sample is around 4.2 times higher than that of NBT-SM sample prepared by the conventional sintering method (NBT-SM-CS). There is higher mobile oxygen vacancy concentration and vacancy mobility capability in the NBT-SM-SPS sample, which is the reason that there is higher oxygen ion conductivity in NBT-SM-SPS sample. The aging behavior investigation was carried out at 573 K. After 48 h aging, there is around 12.3% degradation of the grain conductivity in the NBT-SM-SPS sample. The conductivity degradation should result from the decrease of the oxygen vacancy mobility capability and mobile vacancy concentration.
KeywordsNa0.5Bi0.5TiO3 Oxygen ionic conductivity Spark plasma sintering Thermal stability
PACS numbers62.40.+i 66.30.Lw 81.05.Je, 77.80.-e,77.22.Gm
This work has been subsidized by the National Natural Science Foundation of China (Nos.11604286, 51661032), the Shaanxi Provincial Natural Science Foundation (No. 15JK1833), the special project of Yan’an University Institute of Material Physics Research and High-level University Construction Special Program of Shaanxi Province (No. Physics-2012SXTS05), the Yan’an University National Natural Science Foundation (Nos. YD2015-07, YDBK2014-01, YDBK2018-20), and by the Shanxi Provincial College students’ innovative projects (Nos. D2017143, D2017163).
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