The nuclear quadrupole interactions at ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}$ probe nuclei in Re and Zr hosts are measured in the temperature range 4-900 K employing time differential perturbed ($\gamma -\gamma$) angular correlation of the 173-247-keV cascade. Using the known quadrupole moment of the 247-keV state of ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}$, the electric field gradient (EFG) at 293 K for ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}Re=1.60\mathrm{}\times {10}^{17}$ V/${\mathrm{cm}}^2$ and for ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}Zr=0.79\mathrm{}\times {10}^{17}$ V/${\mathrm{cm}}^2$. Both metallurgically prepared and implanted sources were used. The temperature variation of the EFG for ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}\mathrm{Re}$ is quite small and is about 12% over the temperature range 4-860 K. Since the sign of the EFG is known from ($\beta -\gamma$) angular correlation measurements reported earlier, we are able to obtain the electronic part precisely. The electronic part is about 2.1 times the lattice part and is essentially constant over the temperature range studied showing that the entire temperature variation comes from the lattice part. For ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}\mathrm{Zr}$ the electronic part is about 1.9 times the lattice part if we assume that the sign of the electronic contribution is opposite to the sign of the lattice part. The EFG is highly temperature dependent and changes by about 57% over 4-890 K. For this system also, the temperature dependence is neither given by the linear $T$ dependence nor by the $T^{\frac{3}{2}}$ law. The results are discussed in the light of the systematic trends and the currently available semiempirical and theoretical models.

• Received 28 July 1980

DOI:https://doi.org/10.1103/PhysRevB.23.2674