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Preparation and electrical conductivity of BaZr0.8Y0.2O3-δ/(ZrO2)0.92(Y2O3)0.08 proton/oxygen ion conducting composite ceramic

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Abstract

To improve the sintering performance of doped barium zirconate, (ZrO2)0.92(Y2O3)0.08 (YSZ) was added and BaZr0.8Y0.2O3-δ (BZY)-x%YSZ (x = 20, 30 and 50% by weight) composite ceramics were prepared by mechanical ball milling combined with high-temperature sintering in air. The crystalline structure, chemical composition, microstructure and electrical properties of the composite electrolytes were characterized by XRD, SEM, TEM, EDS and EIS, respectively. The composite electrolytes only consist of BZY and YSZ phases, and there are no precipitates in BZY/YSZ grain boundaries according to the HR-TEM analysis. YSZ addition can improve the sintering properties of the composite electrolytes. When the composite ceramics with YSZ content of 50 wt% are sintered at 1450 °C for 6 h, the relative density and linear shrinkage are optimal. At 700 °C, the electrical conductivity of BZY-50%YSZ ceramic reaches 1.95 × 10−4 S/cm and 1.67 × 10−4 S/cm in the dry air and moist air, respectively.

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Funding

This study was financially supported by the National Natural Science Foundation of China (51462018), the Academic Team Research Project on Membrane & Electrode Materials of Advanced Batteries in Kunming University of Science and Technology (No. 14078311), the Undergraduate Training Programs for Innovation and Entrepreneurship of Yunnan Province (No. 201710674203) and the Testing Fund of Kunming University of Science and Technology (No. 2017M20162130037).

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Authors and Affiliations

  1. Faculty of Materials Science & Engineering, Kunming University of Science & Technology, Kunming, Yunnan Province, 650093, People’s Republic of China

    X. Y. Luo, B. Meng, M. Y. Zhao, H. Xie, L. F. Bian & X. Yang

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  1. X. Y. Luo
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  2. B. Meng
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  3. M. Y. Zhao
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  4. H. Xie
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  5. L. F. Bian
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  6. X. Yang
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Correspondence to B. Meng.

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Luo, X.Y., Meng, B., Zhao, M.Y. et al. Preparation and electrical conductivity of BaZr0.8Y0.2O3-δ/(ZrO2)0.92(Y2O3)0.08 proton/oxygen ion conducting composite ceramic. Ionics 25, 1157–1165 (2019). https://doi.org/10.1007/s11581-018-2780-3

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