Abstract
Lanthanum- and zirconium-doped perovskite Ba0.5Sr0.5Fe0.9Cu0.1O3-δ ceramics, i.e., LaBa0.5Sr0.5Fe1.8Cu0.2O6-δ (LBSFC) and Ba0.5Sr0.5Fe0.85Cu0.1Zr0.05O3-δ (BSFCZ), were synthesized and characterized. The characterizations include x-ray diffraction, scanning electron microscopy, x-ray near-edge absorption spectroscopy of the Fe K-edge and Cu K-edge, iodometric titration, and electrical conductivity measurements. The structure of BSFCZ was pseudo-cubic single perovskite, whereas LBSFC was orthorhombic double perovskite. It was also discovered that the iron and copper in the octahedron-site has a mixed oxidation state with iron having 3+/4+ and copper 2+/3+. The ratio of Fe3+/Fe4+ was found to be 59/41 for LBSFC and 75/25 for BSFCZ. Similarly, copper has a mixed Cu2+/Cu3+ = 24/76 for BSFCZ and 44/56 for LBSFC. The unit cell symmetry, the presence of La3+, and the formation of Fe4+/Cu3+ are thought to be responsible for the improvement in the electrical conductivity and performance of the LBSFC. In contrast, the Zr4- stabilized perovskite structure was unfavorable for electrical conductivity. The electrical performance of the LBSFC achieved a maximum conductivity σ = 150 S/cm-1 at 500°C.
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Acknowledgments
This research is financed by the Indonesian Ministry of Research and Higher Education through the Doctorate Dissertation Program. The authors would like to thank the SUT-NANOTEC-SLRI joint research facility for synchrotron utilization, Thailand, for XAS beam time.
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Fitriana, F., Muniroh, M., Zainuri, M. et al. XRD, XANES, and Electrical Conductivity Analysis of La- and Zr-Doped Ba0.5Sr0.5Fe0.9Cu0.1O3-δ Suitable for IT-SOFC Cathodes. J. Electron. Mater. 50, 5838–5845 (2021). https://doi.org/10.1007/s11664-021-09110-4
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DOI: https://doi.org/10.1007/s11664-021-09110-4