Temperature Dependence of the Raman Spectra of ZrO ₂

Abstract

Raman spectra of ZrO 2 were measured in the range 300° to 1600°K. Irreducible components of the Raman spectra were obtained from polarization measurements at room temperature, and the symmetries of the Raman‐active modes in the monoclinic phase were determined. The temperature dependence of the spectra shows a hysteresis. In the temperature range of phase change, two kinds of Raman lines coexist. Six Raman‐active mode frequencies were found in the tetragonal phase at high temperatures. Analysis of the spectra showed that the Raman‐active modes in the tetragonal phase are affected by strain introduced into the crystals during the phase transformation.