DIELECTRIC MATERIAL EXHIBITING POLARIZATION TWIST, DIELECTRIC STRUCTURE IN WHICH POLARIZATION CAN BE CONTROLLED AND CAPACITOR AND PIEZOELECTRIC ELEMENT EACH USING SAME, AND CERAMIC AND CAPACITOR AND PIEZOELECTRIC ELEMENT EACH USING SAME

摘要

[Problem] To provide: a dielectric material exhibiting polarization twist; a dielectric structure in which polarization can be controlled, and a capacitor and a piezoelectric element each using the dielectric structure; and a ceramic, and a capacitor and a piezoelectric element each using the ceramic.[Solution] A dielectric material exhibiting polarization twist, in which the concentration of vacancy of anions on X-site, which are introduced as the result of the formation of A-site vacancy, i.e., the deficiency of a metal located on A-site at each apical position of a cubic crystal or a pseudo-cubic crystal, is 1% or less, octahedrons of anions present in a perovskite structure are arranged with twisting an angle ω around the crystal axis of the cubic crystal or the pseudo-cubic crystal, and both of the angle ω and the polarization value vary upon the application of an electric field. In a ceramic represented by general formula: (A1_(1-x+δ)/2A2_(1-x-3δ)/2A3_x□_δ)BO₃, the properties of the ceramic can be controlled by adjusting the combination of the amount δ of A-site vacancy and the amount x of A3.