The dielectric behavior, impedance spectroscopy and energy-storage properties of 0.85[(1-x)Bi0.5Na0.5TiO3-xBaTiO3]-0.15Na0.73Bi0.09NbO3 [(BNT-xBT)-NBN] ternary ceramics were investigated. Temperature dependent permittivity curves displayed two depressed anomalies, resulting in significantly improved dielectric temperature stability. (BNT-9BT)-NBN showed a permittivity of 1680 at 150 °C with Δϵ/ϵ150 °C varying no more than ±10% up to 340 °C. From the complex impedance analysis, grain and grain boundary shared the same time constant. The high temperature resistivity followed the Arrhenius law with Ea=1.7-2.0 eV, suggesting intrinsic band-type electronic conduction. The maximum energy-storage density of all the samples reached 1.1-1.4 J/cm3, accompanied with good temperature stability in the range of 25-140 °C. These results indicate that (BNT-xBT)-NBN system should be a promising lead-free material for energy-storage capacitor applications.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry