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Investigation of Ti-modified BaBiNb5O15 oxide ion conductor prepared by two-step sintering method

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Abstract

Ti-modified BaBiNb0.95Ti0.05O15-δ (BBN-Ti5-TS) oxygen ion conductors with tungsten bronze structure were prepared by solid-phase reaction and two-step sintering-assisted sintering method. The electrical conductivity and oxygen ion diffusion of the Ti-modified BaBiNb5O15 (BBN) specimen were investigated. Both the grain conductivity and total conductivity of the BBN-Ti5-TS specimen are enhanced relative to the BBN compound. At 623 K, the BBN-Ti5-TS specimen grain conductivity can get up to 1.28 × 10–4 S/cm, half an order of magnitude higher of the pristine BBN specimen. A relaxation peak associated with thermal activation was observed in the BBN-Ti5-TS specimen with a relaxation activation energy parameter of E = 0.44 eV. The value is slightly lower than the activation energy of oxygen ion migration in the parent compound. Combining the relaxation parameter and structural analysis, the titanium doping and two-step sintering-assisted sintering can reduce the energy barrier for oxygen ion diffusion to a certain extent. Compared with the BBN specimen, the lower oxygen diffusion activation energy and smaller grain size are the main reasons for the significant increase in the conductivity of the BBN-Ti5-TS compound.

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Funding

This work has been subsidized by the National Natural Science Foundation of China (Nos. 12064044, 11604286), Startup Foundation for Doctors of Yan’an University (No. YAU202212287).

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Authors and Affiliations

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

    Chan He, Shuyao Cao, Weiguo Wang, Gangling Hao, Xianyu Li, Xinfu Wang & Dan Wang

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  1. Chan He
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  2. Shuyao Cao
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  3. Weiguo Wang
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  4. Gangling Hao
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  5. Xianyu Li
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  6. Xinfu Wang
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  7. Dan Wang
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Contributions

The experimental exploration and data acquisition for this manuscript were performed by all co-authors. The analysis of the experimental data and the writing of this manuscript were done by the first author: CH and SC. The revision and improvement of this manuscript were done by the corresponding author: WW and GH. The preparation of experimental reagents and materials in this manuscript were done by the other author: XL, XW and DW. This manuscript is published with the consent of all co-authors.

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Correspondence to Weiguo Wang or Gangling Hao.

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He, C., Cao, S., Wang, W. et al. Investigation of Ti-modified BaBiNb5O15 oxide ion conductor prepared by two-step sintering method. J Mater Sci: Mater Electron 33, 25053–25062 (2022). https://doi.org/10.1007/s10854-022-09212-7

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  • DOI: https://doi.org/10.1007/s10854-022-09212-7

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