Abstract
This paper reports the results of chemical diffusion coefficient measurements for oxygen in (La,Sr)(Mn,Co)O 3 and (La,Sr)(Mn,Fe)O 3 using a manometric method in the temperature range of 773 to 1023 K. It was observed that the addition of Fe or Co into (La 4 x Sr x ) 1− y MnO 3 results in a substantial increase of the chemical diffusion coefficient. In the range 25–100 mol% of Co or Fe substitution at B-site in (La,Sr)MnO 3, the chemical diffusion coefficient exhibits much lower activation energy than that in (La,Sr)MnO 3. The chemical diffusion data in (La,Sr)(Mn,Co)O 3 and (La,Sr)(Mn,Fe)O 3 system determined by the manometric method are generally in agreement with those determined by electrochemical relaxation methods reported in the literature. A comparison of the chemical diffusion data indicates that the oxygen mobility is lowest in (La,Sr)MnO 3 and highest in (La,Sr)CoO 3.
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