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A rapid surge in the research on piezoelectric sensors is occurring with the arrival of the Internet of Things. Single-phase oxide piezoelectric materials with giant piezoelectric voltage coefficient ( g , induced voltage under applied stress) and high Curie temperature ( T  c ) are crucial towards providing desired performance for sensing, especially under harsh environmental conditions. Here, we report a grain-oriented (with 95% <001> texture) modified PbTiO 3  ceramic that has a high  T  c  (364 °C) and an extremely large  g  33  (115 × 10 −3  Vm N −1 ) in comparison with other known single-phase oxide materials. Our results reveal that self-polarization due to grain orientation along the spontaneous polarization direction plays an important role in achieving large piezoelectric response in a domain motion-confined material. The phase field simulations confirm that the large piezoelectric voltage coefficient  g  33  originates from maximized piezoelectric strain coefficient  d  33  and minimized dielectric permittivity  ɛ  33  in [001]-textured PbTiO 3  ceramics where domain wall motions are absent.

Giant piezoelectric voltage coefficient in grain-oriented modified PbTiO3 material