PIEZOELECTRIC/ELECTROSTRICTIVE CERAMIC COMPOSITION, PIEZOELECTRIC/ELECTRO-STRIC SINTERED COMPACT, PIEZOELECTRIC/ELECTROSTRICTIVE ELEMENT, METHOD FOR PRODUCING PIEZOELECTRIC/ELECTROSTRICTIVE COMPOSITION, AND METHOD FOR PRODUCING PIEZOELECTRIC/ELECTROSTRICTIVE ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric/electrostrictive ceramic and a piezoelectric/electrostrictive element with large electric field-induced strain without performing an aging treatment.;SOLUTION: The piezoelectric/electrostrictive ceramic has the composition represented by the general formula: xBNT-yBKT-zBT (x+y+z=1) wherein at least one among A-site elements is allowed to become deficient from stoichiometry in which a point (x, y, z) representing content ratios x, y and z of BNT, BKT and BT is within a range (including a border line) of a quadrangle ABCD with the points A, B, C and 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. Besides, an amount of A-site vacancies becomes at least 2 mol% to at most 6 mol%.;COPYRIGHT: (C)2010,JPO&INPIT