inside grain b oundarie s and doma in walls such as impurit y
atoms and latt ice vacanc ies creating a space -charge field to
restri ct the moveme nt of doma in wall s. As the grain size
incr eased, the surface area of the space-ch arge field which
im peded the movement of doma in walls decr eased significa ntly
thus piez oelectri c coefficie nts could be improved. Sim ilarly,
p revious research has also dem onstrated that piezoel ectric