Abstract
A SOFC cathode related perovskite material, (La0.7Sr0.3)0.9MnO3, has been investigated by simultaneous thermogravimetry - mass spectrometry from room temperature to 1770 K. Water, carbon dioxide and oxygen were detected by mass spectrometry. Water and carbon dioxide evolution can be interpreted by assuming that prior to the thermogravimetry-mass spectrometry measurement about 0.5 % of the lanthanum component had reacted with carbon dioxide and water to form La2(CO3)3*8H2O, which dehydrated and decomposed via La2O2CO3 into La2O3 and evolving H2O and CO2 during the present experiment. The observation that the lanthanum strontium manganite emitted oxygen in two stages can be ascribed to the two different oxygen sites in the perovskite lattice, that is, the oxygen excess and deficient regions.
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Yokokawa, H., Sakai, N., Horita, T. et al. Simultaneous thermogravimetry - mass spectrometry for a solid oxide fuel cell cathode: (La0.7Sr0.3)0.9MnO3 . Ionics 2, 190–195 (1996). https://doi.org/10.1007/BF02376020
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DOI: https://doi.org/10.1007/BF02376020