Abstract
La0.58Sr0.4Co0.2Fe0.8O3− δ (LSCF) deposited on a metallic porous support by plasma spray-physical vapor deposition is a promising candidate for oxygen-permeation membranes. Ionic transport properties are regarded to depend on the fraction of perovskite phase present in the membrane. However, during processing, the LSCF powder decomposes into perovskite and secondary phases. In order to improve the ionic transport properties of the membranes, spraying was carried out at different oxygen partial pressures p(O2). It was found that coatings deposited at lower and higher oxygen partial pressures consist of 70% cubic/26% rhombohedral and 61% cubic/35% rhombohedral perovskite phases, respectively. During annealing, the formation of non-perovskite phases is driven by oxygen non-stoichiometry. The amount of oxygen added during spraying can be used to increase the perovskite phase fraction and suppress the formation of non-perovskite phases.
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Acknowledgments
The authors gratefully acknowledge Mr. Ralf Laufs for his help with the use of the PS-PVD facility. The work on membranes by PS-PVD was part of the DEMOYS Project funded from the European Community’s Seventh Framework Programme, FP7/2007-2013, under Grant Agreement No. 241309.
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This article is an invited paper selected from presentations at the 2015 International Thermal Spray Conference, held May 11–14, 2015, in Long Beach, California, USA, and has been expanded from the original presentation.
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Marcano, D., Mauer, G., Sohn, Y.J. et al. The Role of Oxygen Partial Pressure in Controlling the Phase Composition of La1−x Sr x Co y Fe1−y O3−δ Oxygen Transport Membranes Manufactured by Means of Plasma Spray-Physical Vapor Deposition. J Therm Spray Tech 25, 631–638 (2016). https://doi.org/10.1007/s11666-016-0383-y
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DOI: https://doi.org/10.1007/s11666-016-0383-y