| 摘要 |
A composition of a ferroelectric oxide represented by General Formula (a) is adjusted such that the most stable crystal structures X and Y of ACO3 and BDO3, respectively, have different symmetry characteristics and different directions of polarization, and such that Formula (1) is satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>(Ax,B1-x)(Cy,D1-y)O3 (a)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|E(X)-E(Y)|<=E.PV (1)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein each of A to D represents at least one kind of a metal element, E(X) and E(Y) represent the energy at the time of the crystal structures X and Y, respectively, P represents the spontaneous polarization density vector, E represents the actuating electric field vector, and V represents the volume of the fundamental lattice.
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