Monoclinic phase ofPbZr0.52Ti0.48O3ceramics: Raman and phenomenological thermodynamic studies

This work reports on the first Raman detection of the tetragonal to\nmonoclinic phase transition in PZT ceramics near morphotropic phase boundary at\nlow temperatures. The transition is characterized by changes in the frequency\nof lattice modes with the temperature. The results presented here confirm the\nprevious one recently reported by Noheda et al. using high-resolution\nsynchrotron X-ray powder diffraction technique and dielectric measurements. The\nstability of the new phase is discussed within the framework of\nphenomenological Landau-Devonshire Theory.\n