Abstract
The electric field gradients in ZrO2 and HfO2 have been measured by applying the differential perturbed angular correlation method to the 133-482 keV cascade in 181Ta. The results for HfO2 have been compared with previous results. In general, a fairly good agreement has been found except for the electric field asymmetry parameter eta , in which the older result of Gerdau (1969) et al, rather than the more recent one of Gardner and Prestwich (1970) has been confirmed. The results for ZrO2 show the electric field gradient to be (13.3+or-0.7)*1017 V cm-2 which is slightly higher than the value of (12.8+or-0.6)*1017 V cm-2 obtained for HfO2. The corresponding values for the field asymmetry are 0.335+or-0.015 for ZrO2 and 0.348+or-0.016 for HfO2. Despite the small difference of only 4% between the corresponding means, the 't' distribution shows, with confidence of better than 99%, that the results for ZrO2 and HfO2 are different.
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