The nanometer-sized tetragonal ZrO~2 doped by Y~2O~3 is produced by a chemical method. It is shown by the X-ray diffraction and Raman analysis that the tetragonal nano-ZrO~2 obtained is not a stable phase. We describe the occurrence of small amount monoclinic ZrO~2 at the elevated temperatures is the result of the decrease in nanometer size effect, which lead to a little deformation of tetragonal phase in. For the samples calcined at 600℃, Raman spectra show that the Zr-O(Ⅱ) coordination (outer oxygen coordination) are strengthened by the increasing of compaction pressure used in the consolidation of the samples, suggesting the tetragonal phase is easily changed in the nanometer-sized oxide system.

Key words: X-RAY DIFFRACTION ANALYSIS, SPECTROGRAPHIC ANALYSIS, ZIRCONIUM OXIDE, DOPE, PHASE ANALYSIS, YTTRIUM OXIDE, RAMAN SPECTROMETRY, AMORPHOUS, SIZE EFFECT