The kinetics of isotope exchange of O between dense La0.7Sr0.3CoO3-δ ceramics and the gas phase was studied at 950 to 1130K under O pressures of 0.8 to 1.6kPa. The diffusion coefficient was described by:

D(cm2/s) = 4.8 x 10-4 exp[-0.8(eV)/kT]

E.K.Kurumchin, G.K.Vdovin, V.I.Tsidilkovskii, A.N.Ezin, Z.S.Martemyanova: Russian Journal of Electrochemistry, 1997, 33[3], 268-72