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A strategy for improving the sinterability and electrical properties of gadolinium-doped ceria electrolyte using calcium oxide additive¤
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jre.2020.06.011
Jihai Cheng , Ronghao Xu , Yinchao Shi

Abstract In this study, Gd and Ca co-doped ceria electrolytes with the compositions of Ce0.8Gd0.2–xCaxO2–δ (x = 0–0.08) were prepared by a novel gel-casting method. The effects of the addition of Ca on the phase compositions, sintering behavior, and electrical properties of samples were investigated. According to the scanning electron microscope results and relative density measurement results, it is found that the addition of particular quantity of CaO can promote the sintering densification with a uniform grain growth. When the sintering temperature is 1400 °C, the sample with 6 mol% addition of Ca has the highest relative density, which reaches 98.5% of the theoretical density. The electrical properties testing results confirm that the electrical conductivity of the samples can be improved significantly by doping appropriate CaO content. The maximum conductivity of 0.082 S/cm can be obtained at 800 °C in the Ce0.8Gd0.12-Ca0.06O1.87 sample. It suggests that CaO can be used as an effective sintering aid and a co-dopant on the optimization of electrical properties for ceria-based electrolytes.

中文翻译:

使用氧化钙添加剂提高钆掺杂氧化铈电解质的烧结性和电性能的策略¤

摘要 在本研究中,采用新型凝胶浇注方法制备了成分为 Ce0.8Gd0.2–xCaxO2–δ (x = 0–0.08) 的 Gd 和 Ca 共掺杂氧化铈电解质。研究了 Ca 的添加对样品的相组成、烧结行为和电性能的影响。根据扫描电镜结果和相对密度测量结果发现,添加一定量的CaO可以促进烧结致密化,晶粒长大均匀。当烧结温度为 1400 ℃时,添加 6 mol% Ca 的样品相对密度最高,达到理论密度的 98.5%。电性能测试结果证实,通过掺杂适当的CaO含量可以显着提高样品的电导率。Ce0.8Gd0.12-Ca0.06O1.87 样品在 800 °C 下可获得 0.082 S/cm 的最大电导率。这表明 CaO 可用作有效的烧结助剂和共掺杂剂,用于优化基于氧化铈的电解质的电性能。
更新日期:2020-06-01
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