Effect of Na~+ on Dielectric Properties of ANT System

The Ag2O-Nb2O5-Ta2O5 (ANT) system is a novel high frequency high permittivity ceramic material which can be sintered below 1150℃. The doping of Na+ can replace A site ions (Ag+) in ANT to form ANNT system. In this paper proper Na+ ions were introduced into ANT system. XRD, SEM, and energy spectrum analysis show that proper Na+ addition makes the lattice parameter reduced, i.e. the capacity of octahedron reduced, the dielectric dissipation factor of the system is improved efficiently because of depression of relaxation polarization of Nb5+, and the dielectric properties of the system are as follows: e 500, tgδ≤ 5 × 10-4, αc=+12ppm/℃, ρv 1012Ω·cm.