Abstract: Raman scattering spectroscopy is widely used to investigate the phase transition of ferroelectrics, including the ferroelectric-paraelectric transition. In the present paper, the phase coexistence of rhombohedral and tetragonal phases caused by Fe2O3 doping in Pb(Zn_1/3Nb_2/3)_0.2(Zr_0.5Ti_0.5)_0.8O₃(0.2PZN-0.8PZT) ceramics was investigated by Raman scattering spectroscopy in detail. On the basis of the Raman scattering analysis on the tetragonal E(3TO) and A₁(3TO) modes and the rhombohedral R l mode, or on the tetragonal E(3LO) and A₁(3LO) modes and the rhombohedral R h mode, the tendency of phase transition induced by Fe₂O₃ doping was evaluated, which has been affirmed by XRD results. This indicates
that Raman scattering analysis is an effective way to investigate the doping effect on the phase coexistence in PZT based ceramics.

Key words: Raman analysis, PZT phase transition, Fe2O3 doping, XRD analysis