IMPURITY HALIDE DIFFUSION IN SILVER CHLORIDE AND SILVER BROMIDE

Using the standard microtome-sectioning technique, the diffusion of bromide and iodide tracers in silver chloride and of chloride and iodide tracers in silver bromide has been studied. In silver chloride both bromide and iodide ions diffuse with the same activation energy as that of the chloride ion. In silver bromide the Arrhenius plots are curved: whereas the iodide ion has the same temperature-dependent activation energy as does bromide, the chloride ion appears to have a rather higher value at high temperatures, with all three energies approaching the same value at low tempeatures. These results are discussed in terms of vacancy mechanisms. © 1969.