Interaction of repulsive impurity pairs in silver

Probe-impurity interactions of In-Cd and In-Zn pairs in silver matrix have been studied using In-111-TDPAC measurements. The interactions are repulsiv e for both the pairs. For 3% alloys, the interaction energy of In-Cd pairs in Ag is 51 +/- 2 meV and that of In-Zn pairs is 19 +/- 1 meV. The Electric Field Gradient (EFG) at Cd-111 due to a single Cd nn impurity to the In pr obe is found to be 0.83 +/- 0.04 X 10(21) V/m(2) while for a Zn impurity is 1.50 +/- 0.05 X 10(21) V/m(2). Cd-Cd contact interaction in silver is also found to be repulsive.