Abstract
Debye-Waller factors in the temperature range 4.2 to 250K have been determined for the alkali iodides and for some standard sources and absorbers for 129I Mossbauer spectroscopy. The results for the alkali iodides are compared with predictions based on various lattice dynamical models. Satisfactory agreement in most but not in all cases exists for the nearest-neighbour interaction model of Kagan and Maslov (1962), the 11-parameter shell model of Cowley et al. used by Gupta (1975) and the deformation dipole model of Hardy used by Jaswal (1966) and by Hardy and Karo (1979).