Raman spectrum of 18O-labelled Hafnia

The Raman spectrum of 18O-labelled monoclinic Hafnia (HfO2) is reported. All of the eighteen Raman bands predicted from a group theoretical analysis are observed. The six Raman bands at 300-130 cm−1 have little dependence on the 18O content, whereas the remaining twelve Raman bands shift to low wavenumbers by the 18O-substitution. The former six are assigned to the HfHf vibrations and the latter twelve are assigned to the HfO or OO vibrations.