We report molecular dynamics and EXFAFS studies of Cd0.4Pb0.6F2 mixed syste
m. A striking feature of molecular dynamics studies in Cd0.4Pb0.6F2 is the
mobility of F- ions below. T-c calculations of defect activation energies a
nd plots of single ion trajectories in this compound show that fluorine ion
s migrate predominantly by a near interstitialcy mode of migration. The res
ults obtained from EXAFS studies on local environments around Cd and Pb cat
ions in this system are consistent with the findings from computer simulati
ons on radial distribution functions. The local environment of Pb2+ ions is
more disordered than that of Cd2+ ions.