Ferroelectric Properties of (Ag, Li)(Nb, Ta)O₃ Ceramics

Abstract

The composition of (Ag 1- y Li y )(Nb 1- x Ta x )O 3 ceramics has been investigated by X-ray analysis and dielectric measurement. Li 1+ was substituted into the Ag 1+ lattice site of Ag(Nb, Ta)O 3 ceramics. The solubility limit of Li 2 O in Ag(Nb, Ta)O 3 was estimated to be in the range from 10 to 15 mol%. The crystal phase and dielectric properties of the (Ag 1- y Li y )(Nb 1- x Ta x )O 3 ceramics significantly changed with Li and Ta concentrations. The crystal phase changed from rhombohedral to monoclinic, tetragonal and cubic with temperature. Strong ferroelectricity was observed via D - E hysteresis measurement, and remanent polarization P r =23 µC/cm 2 and coercive field E c =22 kV/cm were obtained.