Temperature-stable and high-ɛ dielectric ceramics based on Ag (Nb1−xTax)O3

The dielectric properties of novel dielectric system AgNb1−xTaxO3 (ANT) have been studied in this paper. In this system, the temperature coefficient of capacitance (TCC) can be adjusted to 0 ± 30 × 10−6/°C by choosing proper molar ratio of Nb5+ to Ta5+. When 2 wt% glass is added to the ceramics, the sintering temperature is reduced to 960 °C, which restrains Ag+ decomposition in ambient atmosphere. It is noted that the dielectric loss reduces further after adding 2.5 wt% Sb2O5. The dielectric properties of the resultant samples are as follows: dielectric constant ɛ ≈ 512, loss tangent tan δ ≈ 5.2 × 10−4, and TCC ≈ 10 × 10−6/°C.