Structural disorder and phase transitions in ZrO2-Y2O3 system

The phase transitions in the ZrO₂-YzO₃ system have been investigated as a function of temperature using Raman scattering. The cubic phase was found to be structurally disordered and the spectrum has been compared with a one phonon density of states derived from a rigid ion model. The frequencies and symmetries of the modes were obtained for the cubic, tetragonal and monoclinic phases and comparisons have been made between the various temperatures and compositions.