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Angle-dispersive X-ray diffraction, Raman scattering and dielectric spectroscopy measurements versus hydrostatic pressure were carried out to follow the crystalline-to-crystalline transformation occurring in PbZr1 − xTixO3 ceramic powders. Different PZT compositions under hydrostatic pressure up to 20 GPa were studied. Dielectric measurements versus pressure up to 2 GPa are discussed to bring new insights on the Pressure-composition (P-x) phase diagram. Based on these results, an updated version of the PZT (P-x) phase diagram is proposed.