Temperature dependence of the Raman spectra and phase transition of zirconia

A newly constructed high-temperature Raman spectrometer was used to study t he temperature-dependence Raman spectra (up to 2023 K) and transformation o f zirconia crystal. High-temperature Raman scattering is a useful tool in c haracterizing the different structures of zirconia and offers the possibili ty of identifying the phase transformation. It shows that monoclinic zircon ia transforms to tetragonal phase at about 1440 K during the process of inc reasing temperature, but shows a lower transformation temperature from tetr agonal to monoclinic phase at about 1323 K while the temperature decreases.