Local structure of ionic solid solutions: Extended x-ray-absorption fine-structure study

The first-neighbor distances in the ionically bonded rocksalt-structured solid solutions (${\mathrm{K}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Rb}}_{\mathrm{x}}$)Br and Rb(${\mathrm{Br}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{I}}_{\mathrm{x}}$) differ substantially from the averag…