Mechano-chemical coupling of La_(0.6)Sr_(0.4)FeO_(3-δ) thin films were observed below 500°C for the first time using a curvature relaxation technique. Chemical oxygen surface exchange coefficients (k's) were measured by fitting the transient curvature of the thin film|substrate bilayer specimens under controlled temperature and oxygen partial pressure. Reproducible k values and their activation energies were obtained and are consistent with bulk sample k's extrapolated from the literature.
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