[Object] To provide piezoelectric/electrostrictive ceramics and a piezoelectric/electrostrictive element with a large electric field-induced strain without performing an aging treatment.;[Solving Means] Piezoelectric/electrostrictive ceramics have the composition represented by the general formula: xBNT-yBKT-zBT (x+y+z=1) wherein at least one kind among A-site elements are allowed to become deficient from stoichiometry in which a point (x, y, z) representing content ratios x, y and z of (Bi1/2Na1/2)TiO3, (Bi1/2K1/2)TiO3 and BaTiO3 is within a range (also including a border line) of a quadrangle ABCD with a point A, a point B, a point C and a point D as vertices in a ternary phase diagram. Vacancies are formed in an A-site of a perovskite structure by allowing the A-site elements to become deficient from stoichiometry. An amount of A-site vacancies becomes at least 2 mol % to at most 6 mol %.
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机译：目的提供一种压电/电致伸缩陶瓷和一种压电/电致伸缩元件，其电场感应应变大，无需进行时效处理。 -zBT（x + y + z = 1），其中A位元素中的至少一种从化学计量学上变得不足，在化学计量学中，表示（Bi）的含量比x，y和z的点（x，y，z） 1/2 Na 1/2 ）TiO 3 ，（Bi 1/2 K 1 / 2 ）TiO 3 和BaTiO 3 处于四角形ABCD的范围内（也包括边界线），该ABCD具有点A，点B，a三元相图中的点C和点D为顶点。通过使A位元素因化学计量不足而在钙钛矿结构的A位形成空位。 A位空位的量变为至少2mol％至最多6mol％。
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