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- W2075362945 abstract "Electrochemical techniques were applied to a coulometric titration cell to study oxygen nonstoichiometry (δ) and transport in the perovskite-type oxide La0.4Ba0.6Fe0.8Co0.2O3−δ. Slow scan voltammetry (3μV/s) was used to obtain δ vs. the oxygen partial pressure (p(O2)) data. The voltammograms were further analysed using a simple defect model to yield the absolute value of the oxygen nonstoichiometry. Relaxation measurements were performed to obtain chemical diffusion (D˜) and surface exchange (k) coefficients. In particular, the suitability of converting the relaxation data to the frequency domain for analysis purpose was examined. Impedance spectroscopy (EIS) measurements were also performed on the same cell to allow direct comparison. A satisfactory agreement was obtained for D˜ but the k values were systematically different by a factor 2 to 3. This discrepancy was attributed to the short-time extrapolation used in the numerical conversion procedure. Finally, other transport coefficients (σi, DV and DO) were calculated from the chemical diffusion and nonstoichiometry data." @default.
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- W2075362945 date "2004-10-29" @default.
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- W2075362945 doi "https://doi.org/10.1016/j.ssi.2004.07.028" @default.
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