Abstract The interaction between oxygen in the gas phase and La2–xCaxZr2O7–α (x = 0; 0.05; 0.1) with a pyrochlore structure was studied by the isotope exchange method with the gas phase equilibration… Click to show full abstract
Abstract The interaction between oxygen in the gas phase and La2–xCaxZr2O7–α (x = 0; 0.05; 0.1) with a pyrochlore structure was studied by the isotope exchange method with the gas phase equilibration in the temperature range of 600–900 °C and the oxygen pressure of 1.01 kPa. The oxygen diffusion and oxygen surface exchange coefficients were calculated for the investigated oxides. The rate-determining stage of the oxygen surface exchange kinetics for La1.9Ca0.1Zr2O7–α was found to be different from that for La1.95Ca0.05Zr2O7–α and La2Zr2O7–α. The influence of the calcium content in La2–xCaxZr2O7–α (x = 0; 0.05; 0.1) oxides on the heterogeneous exchange rates and oxygen tracer diffusion coefficients were discussed.
               
Click one of the above tabs to view related content.