Recent reports of remarkably high oxygen ion conductivity in a new family of layered strontium silicates have questioned the rationale for materials design in solid electrolytes. Here, we present a re-investigation of the crystal structure, microstructure, total conductivity and perform the first direct investigation of oxygen ion diffusivity of a nominal Sr0.8K 0.2Si0.5Ge0.5O2.9 composition. The results show very low levels of oxide ion conductivity, which do not correlate with total electrical conductivity. Furthermore, sub-micron elemental mapping reveals a previously unreported inhomogeneous chemical composition. The absence of evidence for secondary phases in the diffraction data suggests that the additional phases are amorphous in nature. This journal is © the Partner Organisations 2014.
CITATION STYLE
Bayliss, R. D., Cook, S. N., Fearn, S., Kilner, J. A., Greaves, C., & Skinner, S. J. (2014). On the oxide ion conductivity of potassium doped strontium silicates. Energy and Environmental Science, 7(9), 2999–3005. https://doi.org/10.1039/c4ee00734d
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