Abstract
An attempt is made to explain the electric field gradient (EFG) and asymmetry parameter (η) measured at the 100Rh probe atom in dilute alloys of Ag and Au. The impurity effective valency is decided according to the Friedel criterion of bound states. The valence effect EFG is evaluated using the impurity induced charge density calculated self-consistently in the density functional formalism. The size effect EFG is evaluated in the elastic continuum model for the lattice, considering the dressed point ions interacting through the screened Coulomb potential which is determined with the help of impurity-probe binding energy. The size effect EFG is found to be larger than the valence effect EFG by an order of magnitude. The calculated values of EFG and η are found to be in fairly good agreement with the experimental values for all the alloys except Au Sn.
Published Version
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