Abstract
EXAFS at the iodine L3 edge in beta - and gamma -AgI has been studied. The EXAFS Debye-Waller factors of the first and second coordination shells of iodine have been extracted by a standard analysis based on the harmonic approximation. No difference has been found between the temperature dependence of mean square relative displacements (MSRD) of the two beta and gamma phases. The harmonic approximation has been checked against more complete anharmonic EXAFS and X-ray diffraction analyses; it has been found adequate to interpret the MSRDs of AgI for temperatures lower than 300 K. The experimental MSRDs for the two distances I-Ag and I-I have been compared with MSRDs calculated on the grounds of the available lattice dynamics models. The sensitivity of EXAFS to phonon polarization properties has been made evident.
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