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Limiting current oxygen sensors with La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte and La0.8Sr0.2(Ga0.8Mg0.2)1-x Co x O3-δ dense diffusion barrier

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Abstract

A conventional solid-state reaction was used to synthesize La0.8Sr0.2(Ga0.8Mg0.2) x Co1-x O3-δ (LSGMC, x = 0.1, 0.3, 0.5, 0.7, and 0.9) and La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM), of which the structure, conductivity, and thermal expansion behavior were investigated by XRD, four-terminal method, and dilatometry. A limiting current oxygen sensor was prepared with LSGM solid electrolyte and La0.8Sr0.2(Ga0.8Mg0.2)0.1Co0.9O3-δ (LSGMC9) dense diffusion barrier. The effects of temperature, oxygen concentration, and thickness of dense diffusion barrier (L) on sensing properties were investigated. XRD results show that cubic and monoclinic phases are identified for LSGM and LSGMC, respectively. Electrical conductivity increases with x. A change of electrical conductivity from semiconductive to metallic conduction is observed for x = 0.5–0.9 with the temperature rise. Thermal expansion coefficients (TECs) increase to a maximum firstly and then decrease with increasing x at temperature from 300 to 1000 °C. I-V curves of oxygen sensor display a good limiting current plateau. The relationship between limiting current and oxygen concentration is linear. The limiting current decreases with increasing L.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (51374055 and 51274059).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, Liaoning, 110819, China

    Xiaofang Zhang, Tao Liu, Jingkun Yu, Hongbin Jin, Xiangnan Wang, Cheng Wang & Xiang Gao

  2. Dalian Best Justicial Sheng Hongyuan Testing Technology Co. Ltd., Dalian, Liaoning, 116000, China

    Huimin Zhang

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  1. Xiaofang Zhang
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  2. Tao Liu
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  3. Huimin Zhang
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  4. Jingkun Yu
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  5. Hongbin Jin
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  7. Cheng Wang
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  8. Xiang Gao
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Correspondence to Tao Liu.

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Zhang, X., Liu, T., Zhang, H. et al. Limiting current oxygen sensors with La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte and La0.8Sr0.2(Ga0.8Mg0.2)1-x Co x O3-δ dense diffusion barrier. Ionics 24, 827–832 (2018). https://doi.org/10.1007/s11581-017-2245-0

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  • DOI: https://doi.org/10.1007/s11581-017-2245-0

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