两步烧结对双掺杂YSZ复合电解质硬度和电性能的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-07-17 DOI:10.1016/j.jallcom.2025.182313

Yaya Liu, Shuangshuang Liu, Long Wang, Kexue Peng, Guifang Han, Ying Qiao, Jingde Zhang

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引用次数: 0

摘要

通过控制第一、二步烧结温度（T₁=1000~1100℃，T₂=800~900℃）和保温时间（2~6 h），提出了双掺杂YSZ （Bi-YSZ）电解质的两步烧结工艺，以抑制晶粒粗化和调节氧空位。该方法进一步降低了烧结温度，抑制了晶粒长大，晶粒细化均匀，提高了材料的硬度值。此外，低温烧结减少了Bi2O3的挥发，有利于提高氧空位浓度和电解质的导电性。制备的样品在800℃时的离子电导率为0.098 S·cm-1，是一步烧结法样品（0.032 S·cm-1）的3倍。该研究提供了一种可工程的烧结策略，同时提高了Bi-YSZ电解质的硬度和离子电导率，为推进中温SOFC应用提供了重要见解。

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The Influence of Two-Step Sintering on the Hardness and Electrical Performance of Bi-doped YSZ Composite Electrolyte

A two-step sintering process was proposed for Bi-doped YSZ (Bi-YSZ) electrolytes to suppress grain coarsening and regulate oxygen vacancy by controlling the first- and second-step sintering temperature (T₁=1000~1100 ℃, T₂=800~900 ℃) and also the holding time (2~6 h). This approach further reduced the sintering temperature, suppressed grain growth, and resulted in uniformly refined grains, improving the hardness value of the material. Additionally, low-temperature sintering minimized the volatilization of Bi₂O₃, which is beneficial for increasing the concentration of oxygen vacancies and conductivity of the electrolyte. Thus, fabricated sample exhibited an ionic conductivity of 0.098 S·cm^-1 at 800 ℃, which was three times of that (0.032 S·cm^-1) of samples prepared by one-step sintering. This study provides an engineerable sintering strategy to simultaneously enhance hardness and ionic conductivity of Bi-YSZ electrolytes, offering critical insights for advancing intermediate-temperature SOFC applications.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.