Relaxor behavior of piezoelectric Pb(Yb1/2Nb1/2)O3-PbTiO3 ceramics sintered at low temperature

A (100-x)Pb(Yb1/2Nb1/2)O-3-xPbTiO(3) [PYN-PTx] solid solution system with 49.0 a parts per thousand currency signaEuro parts per thousand x a parts per thousand currency signaEuro parts per thousand 51.0 was prepared using a conventional ceramics process and sintered at low temperature. When excess PbO was added into the PYN-PTx system, all samples were sintered at temperatures as low as 800A degrees C with good dielectric and piezoelectric properties. It is suggested that a liquid phase with excess PbO was formed during the sintering and improved the densification of PYN-PTx ceramics at low temperatures. For the PYN-PTx binary system, it was found that the temperature dependence of the relative permittivity follows a Curie-Weiss Law above the deviation temperature (T-D) at high temperatures. Good piezoelectric properties of d (33) = 510 pC/N, epsilon (r) = 2800 at RT, k (p) = 0.57, and k (t) = 0.42 with T-c = 373A degrees C were obtained for PYN-PT49.5 ceramics sintered at 800A degrees C for 8 h.