PIEZOELECTRIC MATERIAL, MANUFACTURING METHOD THEREOF, AND NON-LINEAR PIEZOELECTRIC ELEMENT
There is provided a piezoelectric material having a movable point defect which is arranged so that its short range order symmetry is matched with the crystalline symmetry of the ferroelectric phase. A large linear voltage effect is obtained by the reversible conversion under an electric field of a domain in the ferroelectric material. Thus, it is possible to provide a piezoelectric material and its element having a large and steep displacement even at a low voltage. Its manufacturing method is also disclosed.