DIELECTRIC AND ELECTROSTRICTIVE PROPERTIES OF PB(ZN1 3NB2/3)O-3-PB(MG1/3NB2/3)O-3-PBTIO3 CERAMIC SOLID-SOLUTIONS/

Perovskite-type ferroelectric ceramics of the Pb(Zn1/3Nb2/3)O-3-PbTiO3 -Pb(Mg1/3Nb2/3)O-3 ternary system have been synthesized by the columbi te method. The dielectric and electrostrictive properties of the prese nt ternary system have been investigated from the view point of actuat or materials. With increasing Pb(Zn1/3Nb2/3)O-3 content, the peak valu e of the dielectric constant decreased; however, the Curie temperature increased. Using suitably selected compositions and sintering process , material has been obtained with Curie temperature near room tempertu re, dielectric constant above 12000, and transverse strain near -3(-)4 x 10(-4) induced at an applied electric field of 20 kV/cm.