Abstract
The stability of the solid oxide fuel cell (SOFC) cathode material 
in 
-containing atmospheres 
is investigated by precision thermogravimetry (TG) and mass spectrometry (MS) as a function of temperature 
. The desorption of 
and 
from samples with different pretreatments is compared. Oxygen exchange at 
is significantly impaired by 
-containing atmospheres. At 
the kinetics of carbonate formation in 
-rich atmosphere is described by a linear-parabolic rate law. A pronounced dependence of the rate constant on the 
content is suggested. Temperature cycles at 
and 
bar, which show effects due to oxygen exchange of the perovskite and due to 
, are analyzed based on reference experiments in a 
-free atmosphere, and under consideration of the TG-MS results. The decomposition temperature of the carbonate in contact with an atmosphere of 
bar amounts to 
. Complementary, the impact of carbonate formation on the oxygen exchange kinetics is investigated by conductivity relaxation measurements. A severe degradation of the surface oxygen exchange coefficient is observed after 
of exposure to ambient air. Regeneration and activation of the oxygen exchange kinetics is demonstrated after treatment in a 
-free atmosphere at 
.
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