Effects of La content on the densification, microstructure, and conductivity of doped La_10−xGe₆O_{26±δ} electrolytes

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• 作者：Sea-Fue Wang ; Yi-Xin Liu ; Yung-Fu Hsu ; Chun-Jui Li and Piotr Jasinski
• 刊名：International Journal of Applied Ceramic Technology
• 出版年：2017
• 出版时间：January/February 2017
• 年：2017
• 卷：14
• 期：1
• 页码：84-93
• 全文大小：1935K
• ISSN：1744-7402

文摘

In this study, the influence of La content on the characteristics of Nb-, Mo-, and W-doped La_xGe₆O_{26±δ} electrolytes was investigated through sintering study, X-ray diffraction, scanning electron microscopy, and conductivity measurement. The densification of La_xGe_5.5Nb_0.5O_{26±δ} and La_xGe_5.5W_0.5O_{26±δ} was retarded as the x reached 9.75, while that of La_xGe_5.5Mo_0.5O_{26±δ} improved with increasing La content. The average grain size slightly increased and weight loss due to evaporation of GeO₂ significantly reduced with increasing La content, ranging from 1.39% to 0.26%. Among the systems studied, La_9.33Ge_5.5Nb_0.5O_26.245, La_9.33Ge_5.5Mo_0.5O_26.045, and La_9.50Ge_5.5W_0.5O_26.75 electrolytes revealed great potential for use in SOFC applications.