Dielectric, piezoelectric and strain properties of PMW-PNN-PZT

Abstract

In this paper, the structural, dielectric, piezoelectric and strain properties of Pb[(Mg/sub 1/2/W/sub 1/2/)/sub x/-(Ni/sub 1/3/Nb/sub 2/3/)/sub 0.15-x/-(Zr/sub 0/ /sub .5/Ti/sub 0.5/)/sub 0.85/]O/sub 3/ (X-0-0/spl sim/0.10) ceramics were investigated with the substitution of Pb(Mg/sub 1/2/W/sub 1/2/)O/sub 3/. According to the increase of the substitution amount of Pb(Mg/sub 1/2/W/sub 1/2/)O/sub 3/, Curie temperatures and coercive fields were decreased by the decrease of the tetragonality. Up to the substitution amount of Pb(Mg/sub 1/2/W/sub 1/2/)O/sub 3/ 3 mol%, remnant polarization, dielectric constant and piezoelectric constant were increased. When the substitution amount of Pb(Mg/sub 1/2/W/sub 1/2/)O/sub 3/ was 3 mol%, the dielectric constant and electromechanical coupling factor, k/sub p,/ k/sub 31/, showed the highest value of 2230, 0.64 and 038, respectively. Also, the piezoelectric constant was the largest value of 418, 202 (/spl times/10/sup -12/ C/N), respectively. The strain induced by AC electric field (60 Hz) was increased with the increase of the substitution amount of Pb(Mg/sub /2/W/sub /2/)O/sub 3/.