Patent ID: 8470211

Claim:
A ferroelectric ceramic material with perovskite phase comprising a composition represented by the formula: w Pb(Ni 1/3 Nb 2/3 )O 3 -x Pb(Zn 1/3 Nb 2/3 )O 3 -y Pb(Mg 1/3 Nb 2/3 )O 3 -z PbZrO 3 -(1−w−x−y−z)PbTiO 3 , in which 0<w<1, 0<x<1, 0<y<1, 0<z<1, w+x+y+z<1, and 0.5≦w+x+y, having a single crystalline phase of perovskite structure.