MODE ASSIGNMENTS OF THE RAMAN-SPECTRUM OF MONOCLINIC ZIRCONIA BY ISOTOPIC EXCHANGE TECHNIQUE

The mode assignments of tile sixteen Raman bands observed for monoclin ic zirconia (ZrO2) have been made by measuring the Raman spectra of th e cationic-as well as the anionic-labelled com pounds, that is, Zr-91. 22((O1-xOx)-O-16-O-18)(2) (x = 0.002 to 0.760) and (ZrO2)-Zr-93.80-O-1 6. The four Raman bands at 334, 224, 192, and 180 cm(-1) were not infl uenced by the O-16-O-18 substitution but were shifted to lower wavenum bers by the Zr-91.22-Zr-93.80 substitution, from which they are assign ed to the Zr-Zr vibrations. The three Raman bands at 380. 349. and 308 cm(-1) were shifted to lower wavenumbers by the Zr-91.22-Zr-93.80 as well as the O-16-O-18 substitution, from which they are assigned to th e Zr-O vibrations. The eight Raman bands at 800 to 382 cm(-1) and the band at 105 cm(-1) were shifted to lower wavenumbers by the O-16-O-18 substitution but were shifted to higher wavenumbers by the Zr-91.22-(9 3.80)Z, substitution, from which they are assigned to the O-O vibratio ns.