Oxygen mobility in layered cuprates La2-xSrxCuO4-delta

Oxygen mobility in layered lanthanum cuprates La2-xSrxCuO4-delta is studied by dynamic-thermal isotope exchange method and coulometric titration. Depe nding on the temperature, different preferred surface exchange reactions ar e realized. Such characteristics of bulk diffusion process as activation en ergy and diffusion coefficient are stated for the cuprates. Theoretical mod eling of diffusion process in La2CuO4 and LaSrCuO3.5 phases is carried out using molecular dynamics simulations. The data obtained are compared to the ones previously obtained experimentally. (C) 2001 Elsevier Science B.V. Al l rights reserved.