On the use of chemical re-equilibration to determine true diffusivity in CoO

Abstract

This paper discusses problems in the use of chemical re-equilibration to precisely determine the true chemical diffusivity in cobaltous oxide, CoO. It is concluded that it is not at all trivial to obtain meaningful chemical diffusion data. Results published recently on this subject in this Journal are critically analysed and compared with other literature data. It is concluded that the recently published data do not represent true chemical diffusion data and that further studies of the kinetics of exchange processes at gas/solid interfaces are needed to better understand chemical re-equilibration processes.