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Investigation of Sr, Mg codoped Na0.5Bi0.5TiO3 oxide ion conductor prepared by spark plasma sintering

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Abstract

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.

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Funding

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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  1. College of Physics and Electronic Information, Yan’an University, Yan’an, 716000, People’s Republic of China

    W. G. Wang, M. Y. Li, X. Y. Li & G. L. Hao

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  1. W. G. Wang
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  2. M. Y. Li
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  3. X. Y. Li
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  4. G. L. Hao
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Correspondence to W. G. Wang or G. L. Hao.

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Wang, W.G., Li, M.Y., Li, X.Y. et al. Investigation of Sr, Mg codoped Na0.5Bi0.5TiO3 oxide ion conductor prepared by spark plasma sintering. Ionics 25, 4265–4271 (2019). https://doi.org/10.1007/s11581-019-03009-1

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