1990 Volume 98 Issue 1140 Pages 776-780
Nb2O5 additive effects for sintering and electrical properties were investigated in PZT ceramics using the hydrothermally produced powder. Nb2O5 addition in PZT ceramics were suppresive effect for grain growth in sintering properties. On the other hand, Nb2O5 addition was contributed to improve the dielectric loss in electrical properties. As the grain size was decreased, the relative permittivity (εs) at Curie point (Tc) was decreased, the εs curve became suppresive. The values of εs at Tc were 80000 (Nb2O5=0.005mol) and 40000 (Nb2O5=0.01mol), respectively and these exhibited the larger values compared to those made by conventional powder. The electromechanical coupling factors, Kp, were high value above 0.60 at the wide sintering temperature range by Nb2O5 addition above 0.005mol.
