Add to ORKGDescription of the mechanisms responsible for the dissipation of energy in materials is possible thanks to the internal friction (IF) method – a non-destructive method thought to be one of the most sensi-tive ones [1–3]. The method is based on measurements of mechanical losses at various temperatures or various frequencies. The study of the IF of ferroelectrics can provide extensive information about the physics of processes within these materials, and about their domain structures and their interactions with various structural defects. The aim of the present study was to describe the mechanisms responsible for energy dissipation in PZT ceramics obtained by the sol-gel method and sintered by conventional ceramics sintering (CCS). This work ...