Patent ID: 6097058
Filing Date: 2000-08-01
Classification: H01L

Abstract:
A ferroelectric memory device including a ferroelectric layer in which information being stored uses its hysteresis characteristics, wherein the ferroelectric layer is composed of a mixed crystal defined by expressions of;(A1.sub.y1 A2.sub.y2 . . . An.sub.yn).sub.2 (B1.sub.x1 B2.sub.x2 . . . Bm.sub.xm).sub.2 O.sub.7,and wherein x1+x2+ . . . +xm=1,and wherein y1+y2+ . . . +yn=1,and wherein each of x1, x2, . . . xm, y1, y2, . . . yn has a value equal to or greater than 0, and equal to or less than 1,and wherein at least two of x1, x2, . . . xm, y1, y2, . . . yn have values greater than 0, and less than 1,and wherein each of A1, A2, . . . , An is an element selected so as to be different from one another from a group consisting of elements belong to IIa group, IIIa group, and lanthanum series, where IIIa group consists of Sc, Y, La, and Ac,and wherein each of B1, B2, . . . , Bn is an element selected so as to be different from one another from a group consisting of Ti, Nb, Ta, Zr, Hf, Y,wherein the ferroelectric memory device includes a first capacitor having the ferroelectric layer, and a second capacitor connected to the first capacitor substantially in series,and wherein information is stored in accordance with a divided voltage applied to the ferroelectric layer of the first capacitor by applying a voltage which corresponds to the information to be stored to both ends of the first capacitor and the second capacitor connected in series.