Temperature stable (1-x)(0.9Na0.5Bi0.5TiO3-0.1BiAlO3)-xNaTaO3 ceramics and capacitors with ultra-wide operational range

Abstract Temperature stable multilayer ceramic capacitors (MLCCs) are urgently required for electronic equipment applications. In this work, NaTaO3 modified (1-x)(0.9Na0.5Bi0.5TiO3-0.1BiAlO3) ceramics (NBT-10BA-100xNT) were designed and fabricated. The effects of NaTaO3 concentration on the dielectric properties, insulating properties, and energy storage properties were investigated. At the optimum composition of x = 0.25, stable permittivity ( Δ e ′ / e 25 °C ′ ≤ ± 15 % ) and low dielectric loss (tan δ ≤ 0.02) over a wide temperature range of −100–334 °C were achieved. Furthermore, NBT-10BA-25NT based MLCCs with 70Ag/30 Pd inner electrodes were successfully fabricated by tape-casting method, which also exhibited both stable permittivity ( Δ e ′ / e 25 °C ′ ≤ ± 15 % ) and low dielectric loss (tanδ ≤ 0.02) in an ultra-wide temperature range (−100–398 °C). These excellent performances suggest that NBT-10BA-25NT could be a promising candidate of dielectrics with ultra-wide operational temperature range for MLCCs.