Abstract
The interaction of oxygen in the gas phase with double perovskites LnBaCo2O6−δ (Ln=Pr, Sm, Gd) was studied by the isotope exchange method with gas phase equilibration in the temperature range of 600–850°C and the oxygen pressure range of 1.3·10−3–6.6·10−2atm. The oxygen nonstoichiometry of the oxides was determined by means of the thermogravimetric analysis as a function of oxygen partial pressure and temperature in the ranges −3≤log(Po2/atm)≤−0.68 and 600≤T, °C≤850, respectively. The influence of the oxygen nonstoichiometry on the heterogeneous exchange rate and the oxygen tracer diffusion coefficient was discussed. The rate-determining stage of the oxygen surface exchange kinetics for PrBaCo2O6−δ was found to be different in comparison with SmBaCo2O6−δ and GdBaCo2O6−δ. The possible reasons of this observation were considered.
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