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- W2005441346 abstract "The values of the chemical diffusion coefficient (D) and the surface exchange reaction rate constant (k) for the incorporation of oxygen in air, have been determined in Sr4 − xLaxFe6 − yTiyO13 + (x + y)/2 by transient thermogravimetric measurements at 700–1000°C. Only minor changes in the values of D have been observed on doping Sr4Fe6O13 with La and/or Ti. It is suggested that the concentration of interstitial oxygen ions is mainly determined by the inherent properties of the material, and that doping with 10% La and 6.7% Ti on the A- and B-sites do not give significant changes. An activation energy in the range 50–130 kJ mol−1 was found for D. The values of k were found to be nearly independent of the temperature. k is approximately two orders of magnitude larger than D suggesting that the surface kinetics is only rate limiting in the initial stage of the measurements." @default.
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- W2005441346 date "2000-02-01" @default.
- W2005441346 modified "2023-09-23" @default.
- W2005441346 title "Measurements of surface exchange kinetics and chemical diffusion in dense oxygen selective membranes" @default.
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- W2005441346 doi "https://doi.org/10.1016/s0920-5861(99)00289-8" @default.
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