Local atomic environment in silver chlorobromides from exafs

Abstract

The effect of variations in halide ratio on the local atomic environment of silver chlorobromides has been determined using EXAFS (extended X-ray absorption fine structure). The nearest-neighbor Ag-halide distances have been measured, at cryogenic temperatures, for Ag(Cl,Br) solid solutions ranging from pure AgCl to pure AgBr. Significant deviations of the EXAFS nearest-neighbor BrAg and AgCl distances from the “average” X-ray distance have been observed. The EXAFS nearest-neighbor distances are in agreement with the interatomic distance predicted by atomistic simulation studies and demonstrate the usefulness of combining theoretical and experimental methods in the study of the silver halides.