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In this work,we report some new experimental results on the deformation and fracture of PZT ferroelectric ceramics and BaTiO3 single crystals.To explore the mechanism of crystal-symmetry deformation behavior of PZT ceramics,we fabricate tetragonal PZT (45/55),morphotropic PZT (52/48) and rhombohedral PZT (60/40),respectively,and determine the phase structures and lattice constants using powder XRD and Rietveld refinement.