Time-differential perturbed-angular-correlation studies on In-117 and Cd-111 in Li0.995Cd0.005NbO3

The nuclear-electric-quadrupole interactions at In-117 and Cd-111 nuclei arising from Cd-117 and Cd-111m, respectively, chemically introduced in Li0.995Cd0.005NbO3 polycrystals were studied using the time-differential perturbed angular correlation of gamma rays. The \V-zz(lattice)\ values derived for In-117 and Cd-111 coincided with each other, i.e., 3.4(1) x 10(20) V/m(2) and 3.4(5) x 10(20) V/m(2), respectively, meaning that the In and Cd ions are in the same lattice environment in the forms of In3+ and Cd2+. Although these probes are considered to occupy the Li sites, the above values of V-zz(lattice) are substantially different from the previously reported value for Li-7, 0.7 x 10(20) V/m(2), which is ascribable to the structural relaxation around the probe atoms. The temperature dependence of omega(Q) of In-117 indicates that the In ion vibrates anisotropically about its equilibrium position at high temperatures, as has been argued for the Li ion In LiNbO3. [S0163-1829(97)04942-4].