Patent ID: 8034249
Filing Date: 2011-10-11
Classification: C04B,H01L

Abstract:
1. A piezoelectric/electrostrictive ceramic sintered body comprising a microstructure in which a matrix phase and an additional material phase having different compositions coexist, and the additional material phase is dispersed in the matrix phase; wherein a residual strain ratio of the additional material phase alone is larger than a residual strain ratio of the matrix phase alone; wherein a composition of the matrix phase is selected from a composition range of a composite in which a Mn compound containing Mn atoms of at least 0.001 parts by mol to 3 parts by mol and a Sr compound containing Sr atoms of 0 parts by mol or more and 1 part by mol or less are contained in a compound of 100 parts by mol represented by a general formula {Li wherein a composition of the additional material phase is selected from a composition range of a composite in which a Mn compound containing Mn atoms of 0 parts by mol or more and 3 parts by mol or less and a Sr compound containing Sr atoms of 0 parts by mol or more and 1 part by mol or less are contained in a compound of 100 parts by mol represented by a general formula {Li wherein zero or one kind of element is not common to constituent elements of the matrix phase and constituent elements of the additional material phase in comparison therebetween; and wherein the additional material phase alone exhibits a residual strain ratio of 800 ppm or more in a long side direction of a rectangular plate polarized in a thickness direction.