Hydrogen transport properties in zinc oxide

Abstract

Abstract Hydrogen diffusion in single crystal and polycrystalline zinc oxide (ZnO) was investigated by deuterium diffusion and hydrogen effusion measurements. The diffusion coefficient exhibits thermally activated behavior and varies between E A = 0.17 and 0.37 eV. Interestingly, the change in E A is accompanied by a variation of the diffusion prefactor by about eight orders of magnitude. This indicates that E A does not represent the diffusion barrier. On the other hand, the H density of states derived from effusion data is consistent with originally reported values of the diffusion activation energy of E A ≈ 1.0 eV .