| abstract |
A piezoelectric / electrostrictive body having excellent piezoelectric / electrostrictive characteristics and a piezoelectric / electrostrictive portion having a small variation in asymmetry of a DE curve or a large piezoelectric displacement are provided. A piezoelectric / electrostrictive material capable of producing a piezoelectric / electrostrictive element exhibiting the following is provided. A the composition of (1-x) (Bi a Na b TiO 3 + δ) -x (K c NbO 3 + ζ) ( where, 0.01 ≦ x <0.08, a <0.5,1.01 ≦ (a / b) ≦ 1.08, 0.92 ≦ (a + b) / c <0.99, and 0.9 ≦ c ≦ 1.1, and ζ ≠ 0 when δ = 0. , When ζ = 0, δ ≠ 0). This is a piezoelectric / electrostrictive material having a non-stoichiometric composition. [Selection figure] None |