Correlation between electrical and mechanical properties in La1-XSrXGa1-YMgYO3-¿ ceramics used as electrolytes for solid oxide fuel cells
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Document typeArticle
Date issued2014
Rights accessRestricted access - publisher's policy
Abstract
The relation between the electrical and the mechanical properties in Sr and Mg doped LaGaO3 ceramics, which can be used as electrolyte for solid oxide fuel cells, was investigated in terms of hardness and ionic conductivity. For this purpose, ceramic materials corresponding to the compositions of La1 xSrxGa1 yMgyO3 d (LSGM), with x ¼ 0.1 and y ¼ 0.2, and x ¼ 0.15 and y ¼ 0.2, were prepared. LSGM
powders synthesized by the ethylene glycol complex solution method were shaped into disks by
isostatic pressing method. The variation in the microstructure of samples was achieved by varying the sintering temperature between 1300 and 1450 C. While the effect of the different microstructures on
the electrical properties of the LSGM electrolytes was determined by impedance spectroscopy, the influence of the hardness was extracted by instrumented indentation technique. The results showed a
linear correlation between the hardness and total ionic conductivity within the temperature range of 500-660 C, thus indicating that both properties were strongly influenced on the relative density and purity of the samples. It has a potential practical implication: by measuring the LSGM hardness at room temperature, one can achieve an approach to the ionic conductivity within the studied temperature
range.
CitationMorales, M. [et al.]. Correlation between electrical and mechanical properties in La1-XSrXGa1-YMgYO3-¿ ceramics used as electrolytes for solid oxide fuel cells. "Journal of power sources", 2014, vol. 246, p. 918-925.
ISSN0378-7753
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0378775313013682
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