Masahide Akiyama

Lattice diffusion coefficient of oxygen in lithium oxide

Lattice diffusion coefficients of the oxygen ion in antifluorite-cubic Li2O were determined employing polycrystalline samples, in the temperature range of 920 ~ 1130°C, by means of the gas-solid isotope exchange and solid-phase analysis technique; use was made of the relationship between the particle-size and grain-size dependences of the grain-boundary enhanced diffusion. The results were described by D = 1.52 × 103 exp(−83.3 × 103/RT) cm2s and showed a good agreement with the previously reported results determined by the gas-phase analysis technique. Diffusion characteristics of the constituent ions in the antifluorite-cubic structure were discussed in comparison with those in fluorite-cubic crystals.

Self-diffusion of constituent ions in antifluorite-cubic lithium oxide

Abstract The self-diffusion coefficient of the oxygen ion in antifluorite-cubic lithium oxide has been determined by means of the gas-solid isotope exchange and solid-phase analysis technique using 18 O as the tracer. Diffusion characteristics of the constituent ions in antifluorite-cubic crystal are discussed in comparison with those in fluorite-cubic crystals. The ionic conduction mechanism for Li 2 O is discussed in terms of the diffusivities of both ions.