Abstract
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=1.7–2.0eV, suggesting intrinsic band-type electronic conduction. The maximum energy-storage density of all the samples reached 1.1–1.4J/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.
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