Reversible Domain Wall Motion Induced Low Hysteretic Piezoelectric Response in Ferroelectrics

The mobility of domain walls under an external stimulus plays a crucial role in the piezoelectricity of ferroelectric materials, which usually manifests itself as an irreversible and hysteretic characteristic. Herein, we report a reversible domain-wall motion that contributes almost 55% to the significant piezoelectric response ( d33* = 730 pm/V) with low strain hysteresis (HS = 10.76%) at a composition close to the morphotropic phase boundary (MPB) in a (1 – x)Ba(Ti0.88Sn0.12)O3–x(Ba0.7Ca0.3)TiO3 system. Such a reversible domain-wall motion is evidenced by the piezo response force microscopy measurement. Moreover, transmission electron microscopy observation indicates a hierarchical domain structure for MPB composition (x = 0.28), and the associated high-resolution image suggests the presence of spatial local chemical heterogeneity. Combined with phase field modeling, we reveal that the reversible domain-wall motion is attributed to the asymmetric landau free energy profile as a result of morphotropic ph...