Subsurface ionic space charges in silver chloride and silver bromide

Ion transfer in ion-exchange and membrane materials

“…The results of calculations are in good agreement with the data obtained using independent methods. In particular, the surface potential of silver chloride and silver bromide changed from 70.1 to 70.25 eV on heating from 298 to 550 K. 212,213 According to calculations, at room temperature the concentration of cation interstices in these compounds must be three orders of magnitude higher than in the bulk of the crystal. 212 Enhancement of the translational mobility of ions and intensification of the diffusion processes on the surfaces of crystals are due to weak binding of the surface atoms and high imperfection of the surface.…”

“…In particular, the surface potential of silver chloride and silver bromide changed from 70.1 to 70.25 eV on heating from 298 to 550 K. 212,213 According to calculations, at room temperature the concentration of cation interstices in these compounds must be three orders of magnitude higher than in the bulk of the crystal. 212 Enhancement of the translational mobility of ions and intensification of the diffusion processes on the surfaces of crystals are due to weak binding of the surface atoms and high imperfection of the surface. 65,66,214 The contribution of the surface component to transfer processes is most significant for nanomaterials, since the linear size of nanoparticles can be comparable with the thickness of the Debye layer.…”