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Many ferroelectric devices are based on doped lead zirconate titanate (PZT)ceramics with compositions near the morphotropic phase boundary (MPB), at whichthe relevant material's properties approach their maximum. Based on asynchrotron x-ray diffraction study of MPB PZT, bulk fatigue is unambiguouslyfound to arise from a less effective field induced tetragonal-to-monoclinictransformation, at which the degradation of the polarization flipping isdetected by a less intense and more diffuse anomaly in the atomic displacementparameter of lead. The time dependence of the ferroelectric response on astructural level down to 250 $\mu$s confirms this interpretation in the timescale of the piezolectric strain response.

Structural Contribution to the Ferroelectric Fatigue in Lead Zirconate Titanate (PZT) Ceramics