Chemical oxygen diffusion coefficients and chemical surface exchange rates along with oxygen self-diffusion coefficients in dense samples of Sr3YCo4O10.5+delta were studied by using a combination of electrical conductivity relaxation (ECR) measurements and thermogravimetric analysis (TGA) data in the temperature range of 650 degrees C-900 degrees C. Arrhenius behavior, A = A(0) exp(-E-A/RT), was observed with activation energies of E-A(Dchem) = 1.16 +/- 0.01 eV, E-A(Do) = 1.56 +/- 0.01 eV and E-A(kchem) = 0.76 +/- 0.05 eV for the chemical oxygen diffusion coefficient, the oxygen self-diffusion coefficient, and the chemical surface exchange rate, respectively. The thermodynamic factor changes with temperature from 611 at 650 degrees C to 177 at 900 degrees C. (C) 2014 Elsevier B.V. All rights reserved.