Patent ID: 7090785

Claim:
An electromechanically active material comprising: a perovskite compound of the formula, (Na 1/2 Bi 1/2 ) 1-x M x (Ti 1-y M′ y )O 3±z , where M is one or more of Ca, Sr, Ba, Pb, Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; and M′ is one or more of Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni, and 0.01<x<0.3, and 0.01<y<0.3, and z<0.1.