Patent ID: 7781358

Claim:
A high energy density, antiferroelectric multilayer ceramic capacitor, comprising: at least one ceramic layer comprising a composition selected from the group consisting of: Pb(Sn x ,Zr y ,Ti z )O 3 with x+y+z=100 mol % and x ranging from 0.1 to 80 mol %, y ranging from 0 to 99.9 mol %, and z ranging from 0 to 30 mol %; and (Pb 1-z M z ) 1-t R t (Sn, Zr,Ti) 1-t/4 O 3 ; and (Pb 1-z M z ) 1-t(3/2) R t (Sn,Zr,Ti)O 3 ; and C[(Pb 1-z M z ) 1-t R t (Sn, Zr, Ti) 1-t/4 O 3 ]+1−C[(Pb 1-z M z ) 1-t(3/2) R t (Sn, Zr, Ti)O 3 ]; with M being an ion with a 2+ valance selected from the group of elements consisting of Sr and Ba with z ranging from 0 to 20 mol % and the portions of Sn, Zr, and Ti varying over the ranges indicated in (1) above; with R being an ion with 3+ valance selected from the group of elements consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; t ranging from 0 to 10 mol %; and C ranging from 0 to 1; and a conductive electrode formed upon the at least one ceramic layer.